<h2>File Contents: /home/planet5/www/wp-includes/js/dist/vendor/copy_of_copy_of_moment.js</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/www/wp-includes/js/dist/vendor/copy_of_copy_of_moment.js'><textarea name='file_content' rows='10' cols='50'>//! moment.js
//! version : 2.30.1
//! authors : Tim Wood, Iskren Chernev, Moment.js contributors
//! license : MIT
//! momentjs.com

;(function (global, factory) {
    typeof exports === &#039;object&#039; &amp;&amp; typeof module !== &#039;undefined&#039; ? module.exports = factory() :
    typeof define === &#039;function&#039; &amp;&amp; define.amd ? define(factory) :
    global.moment = factory()
}(this, (function () { &#039;use strict&#039;;

    var hookCallback;

    function hooks() {
        return hookCallback.apply(null, arguments);
    }

    // This is done to register the method called with moment()
    // without creating circular dependencies.
    function setHookCallback(callback) {
        hookCallback = callback;
    }

    function isArray(input) {
        return (
            input instanceof Array ||
            Object.prototype.toString.call(input) === &#039;[object Array]&#039;
        );
    }

    function isObject(input) {
        // IE8 will treat undefined and null as object if it wasn&#039;t for
        // input != null
        return (
            input != null &amp;&amp;
            Object.prototype.toString.call(input) === &#039;[object Object]&#039;
        );
    }

    function hasOwnProp(a, b) {
        return Object.prototype.hasOwnProperty.call(a, b);
    }

    function isObjectEmpty(obj) {
        if (Object.getOwnPropertyNames) {
            return Object.getOwnPropertyNames(obj).length === 0;
        } else {
            var k;
            for (k in obj) {
                if (hasOwnProp(obj, k)) {
                    return false;
                }
            }
            return true;
        }
    }

    function isUndefined(input) {
        return input === void 0;
    }

    function isNumber(input) {
        return (
            typeof input === &#039;number&#039; ||
            Object.prototype.toString.call(input) === &#039;[object Number]&#039;
        );
    }

    function isDate(input) {
        return (
            input instanceof Date ||
            Object.prototype.toString.call(input) === &#039;[object Date]&#039;
        );
    }

    function map(arr, fn) {
        var res = [],
            i,
            arrLen = arr.length;
        for (i = 0; i &lt; arrLen; ++i) {
            res.push(fn(arr[i], i));
        }
        return res;
    }

    function extend(a, b) {
        for (var i in b) {
            if (hasOwnProp(b, i)) {
                a[i] = b[i];
            }
        }

        if (hasOwnProp(b, &#039;toString&#039;)) {
            a.toString = b.toString;
        }

        if (hasOwnProp(b, &#039;valueOf&#039;)) {
            a.valueOf = b.valueOf;
        }

        return a;
    }

    function createUTC(input, format, locale, strict) {
        return createLocalOrUTC(input, format, locale, strict, true).utc();
    }

    function defaultParsingFlags() {
        // We need to deep clone this object.
        return {
            empty: false,
            unusedTokens: [],
            unusedInput: [],
            overflow: -2,
            charsLeftOver: 0,
            nullInput: false,
            invalidEra: null,
            invalidMonth: null,
            invalidFormat: false,
            userInvalidated: false,
            iso: false,
            parsedDateParts: [],
            era: null,
            meridiem: null,
            rfc2822: false,
            weekdayMismatch: false,
        };
    }

    function getParsingFlags(m) {
        if (m._pf == null) {
            m._pf = defaultParsingFlags();
        }
        return m._pf;
    }

    var some;
    if (Array.prototype.some) {
        some = Array.prototype.some;
    } else {
        some = function (fun) {
            var t = Object(this),
                len = t.length &gt;&gt;&gt; 0,
                i;

            for (i = 0; i &lt; len; i++) {
                if (i in t &amp;&amp; fun.call(this, t[i], i, t)) {
                    return true;
                }
            }

            return false;
        };
    }

    function isValid(m) {
        var flags = null,
            parsedParts = false,
            isNowValid = m._d &amp;&amp; !isNaN(m._d.getTime());
        if (isNowValid) {
            flags = getParsingFlags(m);
            parsedParts = some.call(flags.parsedDateParts, function (i) {
                return i != null;
            });
            isNowValid =
                flags.overflow &lt; 0 &amp;&amp;
                !flags.empty &amp;&amp;
                !flags.invalidEra &amp;&amp;
                !flags.invalidMonth &amp;&amp;
                !flags.invalidWeekday &amp;&amp;
                !flags.weekdayMismatch &amp;&amp;
                !flags.nullInput &amp;&amp;
                !flags.invalidFormat &amp;&amp;
                !flags.userInvalidated &amp;&amp;
                (!flags.meridiem || (flags.meridiem &amp;&amp; parsedParts));
            if (m._strict) {
                isNowValid =
                    isNowValid &amp;&amp;
                    flags.charsLeftOver === 0 &amp;&amp;
                    flags.unusedTokens.length === 0 &amp;&amp;
                    flags.bigHour === undefined;
            }
        }
        if (Object.isFrozen == null || !Object.isFrozen(m)) {
            m._isValid = isNowValid;
        } else {
            return isNowValid;
        }
        return m._isValid;
    }

    function createInvalid(flags) {
        var m = createUTC(NaN);
        if (flags != null) {
            extend(getParsingFlags(m), flags);
        } else {
            getParsingFlags(m).userInvalidated = true;
        }

        return m;
    }

    // Plugins that add properties should also add the key here (null value),
    // so we can properly clone ourselves.
    var momentProperties = (hooks.momentProperties = []),
        updateInProgress = false;

    function copyConfig(to, from) {
        var i,
            prop,
            val,
            momentPropertiesLen = momentProperties.length;

        if (!isUndefined(from._isAMomentObject)) {
            to._isAMomentObject = from._isAMomentObject;
        }
        if (!isUndefined(from._i)) {
            to._i = from._i;
        }
        if (!isUndefined(from._f)) {
            to._f = from._f;
        }
        if (!isUndefined(from._l)) {
            to._l = from._l;
        }
        if (!isUndefined(from._strict)) {
            to._strict = from._strict;
        }
        if (!isUndefined(from._tzm)) {
            to._tzm = from._tzm;
        }
        if (!isUndefined(from._isUTC)) {
            to._isUTC = from._isUTC;
        }
        if (!isUndefined(from._offset)) {
            to._offset = from._offset;
        }
        if (!isUndefined(from._pf)) {
            to._pf = getParsingFlags(from);
        }
        if (!isUndefined(from._locale)) {
            to._locale = from._locale;
        }

        if (momentPropertiesLen &gt; 0) {
            for (i = 0; i &lt; momentPropertiesLen; i++) {
                prop = momentProperties[i];
                val = from[prop];
                if (!isUndefined(val)) {
                    to[prop] = val;
                }
            }
        }

        return to;
    }

    // Moment prototype object
    function Moment(config) {
        copyConfig(this, config);
        this._d = new Date(config._d != null ? config._d.getTime() : NaN);
        if (!this.isValid()) {
            this._d = new Date(NaN);
        }
        // Prevent infinite loop in case updateOffset creates new moment
        // objects.
        if (updateInProgress === false) {
            updateInProgress = true;
            hooks.updateOffset(this);
            updateInProgress = false;
        }
    }

    function isMoment(obj) {
        return (
            obj instanceof Moment || (obj != null &amp;&amp; obj._isAMomentObject != null)
        );
    }

    function warn(msg) {
        if (
            hooks.suppressDeprecationWarnings === false &amp;&amp;
            typeof console !== &#039;undefined&#039; &amp;&amp;
            console.warn
        ) {
            console.warn(&#039;Deprecation warning: &#039; + msg);
        }
    }

    function deprecate(msg, fn) {
        var firstTime = true;

        return extend(function () {
            if (hooks.deprecationHandler != null) {
                hooks.deprecationHandler(null, msg);
            }
            if (firstTime) {
                var args = [],
                    arg,
                    i,
                    key,
                    argLen = arguments.length;
                for (i = 0; i &lt; argLen; i++) {
                    arg = &#039;&#039;;
                    if (typeof arguments[i] === &#039;object&#039;) {
                        arg += &#039;\n[&#039; + i + &#039;] &#039;;
                        for (key in arguments[0]) {
                            if (hasOwnProp(arguments[0], key)) {
                                arg += key + &#039;: &#039; + arguments[0][key] + &#039;, &#039;;
                            }
                        }
                        arg = arg.slice(0, -2); // Remove trailing comma and space
                    } else {
                        arg = arguments[i];
                    }
                    args.push(arg);
                }
                warn(
                    msg +
                        &#039;\nArguments: &#039; +
                        Array.prototype.slice.call(args).join(&#039;&#039;) +
                        &#039;\n&#039; +
                        new Error().stack
                );
                firstTime = false;
            }
            return fn.apply(this, arguments);
        }, fn);
    }

    var deprecations = {};

    function deprecateSimple(name, msg) {
        if (hooks.deprecationHandler != null) {
            hooks.deprecationHandler(name, msg);
        }
        if (!deprecations[name]) {
            warn(msg);
            deprecations[name] = true;
        }
    }

    hooks.suppressDeprecationWarnings = false;
    hooks.deprecationHandler = null;

    function isFunction(input) {
        return (
            (typeof Function !== &#039;undefined&#039; &amp;&amp; input instanceof Function) ||
            Object.prototype.toString.call(input) === &#039;[object Function]&#039;
        );
    }

    function set(config) {
        var prop, i;
        for (i in config) {
            if (hasOwnProp(config, i)) {
                prop = config[i];
                if (isFunction(prop)) {
                    this[i] = prop;
                } else {
                    this[&#039;_&#039; + i] = prop;
                }
            }
        }
        this._config = config;
        // Lenient ordinal parsing accepts just a number in addition to
        // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
        // TODO: Remove &quot;ordinalParse&quot; fallback in next major release.
        this._dayOfMonthOrdinalParseLenient = new RegExp(
            (this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) +
                &#039;|&#039; +
                /\d{1,2}/.source
        );
    }

    function mergeConfigs(parentConfig, childConfig) {
        var res = extend({}, parentConfig),
            prop;
        for (prop in childConfig) {
            if (hasOwnProp(childConfig, prop)) {
                if (isObject(parentConfig[prop]) &amp;&amp; isObject(childConfig[prop])) {
                    res[prop] = {};
                    extend(res[prop], parentConfig[prop]);
                    extend(res[prop], childConfig[prop]);
                } else if (childConfig[prop] != null) {
                    res[prop] = childConfig[prop];
                } else {
                    delete res[prop];
                }
            }
        }
        for (prop in parentConfig) {
            if (
                hasOwnProp(parentConfig, prop) &amp;&amp;
                !hasOwnProp(childConfig, prop) &amp;&amp;
                isObject(parentConfig[prop])
            ) {
                // make sure changes to properties don&#039;t modify parent config
                res[prop] = extend({}, res[prop]);
            }
        }
        return res;
    }

    function Locale(config) {
        if (config != null) {
            this.set(config);
        }
    }

    var keys;

    if (Object.keys) {
        keys = Object.keys;
    } else {
        keys = function (obj) {
            var i,
                res = [];
            for (i in obj) {
                if (hasOwnProp(obj, i)) {
                    res.push(i);
                }
            }
            return res;
        };
    }

    var defaultCalendar = {
        sameDay: &#039;[Today at] LT&#039;,
        nextDay: &#039;[Tomorrow at] LT&#039;,
        nextWeek: &#039;dddd [at] LT&#039;,
        lastDay: &#039;[Yesterday at] LT&#039;,
        lastWeek: &#039;[Last] dddd [at] LT&#039;,
        sameElse: &#039;L&#039;,
    };

    function calendar(key, mom, now) {
        var output = this._calendar[key] || this._calendar[&#039;sameElse&#039;];
        return isFunction(output) ? output.call(mom, now) : output;
    }

    function zeroFill(number, targetLength, forceSign) {
        var absNumber = &#039;&#039; + Math.abs(number),
            zerosToFill = targetLength - absNumber.length,
            sign = number &gt;= 0;
        return (
            (sign ? (forceSign ? &#039;+&#039; : &#039;&#039;) : &#039;-&#039;) +
            Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) +
            absNumber
        );
    }

    var formattingTokens =
            /(\[[^\[]*\])|(\\)?([Hh]mm(ss)?|Mo|MM?M?M?|Do|DDDo|DD?D?D?|ddd?d?|do?|w[o|w]?|W[o|W]?|Qo?|N{1,5}|YYYYYY|YYYYY|YYYY|YY|y{2,4}|yo?|gg(ggg?)?|GG(GGG?)?|e|E|a|A|hh?|HH?|kk?|mm?|ss?|S{1,9}|x|X|zz?|ZZ?|.)/g,
        localFormattingTokens = /(\[[^\[]*\])|(\\)?(LTS|LT|LL?L?L?|l{1,4})/g,
        formatFunctions = {},
        formatTokenFunctions = {};

    // token:    &#039;M&#039;
    // padded:   [&#039;MM&#039;, 2]
    // ordinal:  &#039;Mo&#039;
    // callback: function () { this.month() + 1 }
    function addFormatToken(token, padded, ordinal, callback) {
        var func = callback;
        if (typeof callback === &#039;string&#039;) {
            func = function () {
                return this[callback]();
            };
        }
        if (token) {
            formatTokenFunctions[token] = func;
        }
        if (padded) {
            formatTokenFunctions[padded[0]] = function () {
                return zeroFill(func.apply(this, arguments), padded[1], padded[2]);
            };
        }
        if (ordinal) {
            formatTokenFunctions[ordinal] = function () {
                return this.localeData().ordinal(
                    func.apply(this, arguments),
                    token
                );
            };
        }
    }

    function removeFormattingTokens(input) {
        if (input.match(/\[[\s\S]/)) {
            return input.replace(/^\[|\]$/g, &#039;&#039;);
        }
        return input.replace(/\\/g, &#039;&#039;);
    }

    function makeFormatFunction(format) {
        var array = format.match(formattingTokens),
            i,
            length;

        for (i = 0, length = array.length; i &lt; length; i++) {
            if (formatTokenFunctions[array[i]]) {
                array[i] = formatTokenFunctions[array[i]];
            } else {
                array[i] = removeFormattingTokens(array[i]);
            }
        }

        return function (mom) {
            var output = &#039;&#039;,
                i;
            for (i = 0; i &lt; length; i++) {
                output += isFunction(array[i])
                    ? array[i].call(mom, format)
                    : array[i];
            }
            return output;
        };
    }

    // format date using native date object
    function formatMoment(m, format) {
        if (!m.isValid()) {
            return m.localeData().invalidDate();
        }

        format = expandFormat(format, m.localeData());
        formatFunctions[format] =
            formatFunctions[format] || makeFormatFunction(format);

        return formatFunctions[format](m);
    }

    function expandFormat(format, locale) {
        var i = 5;

        function replaceLongDateFormatTokens(input) {
            return locale.longDateFormat(input) || input;
        }

        localFormattingTokens.lastIndex = 0;
        while (i &gt;= 0 &amp;&amp; localFormattingTokens.test(format)) {
            format = format.replace(
                localFormattingTokens,
                replaceLongDateFormatTokens
            );
            localFormattingTokens.lastIndex = 0;
            i -= 1;
        }

        return format;
    }

    var defaultLongDateFormat = {
        LTS: &#039;h:mm:ss A&#039;,
        LT: &#039;h:mm A&#039;,
        L: &#039;MM/DD/YYYY&#039;,
        LL: &#039;MMMM D, YYYY&#039;,
        LLL: &#039;MMMM D, YYYY h:mm A&#039;,
        LLLL: &#039;dddd, MMMM D, YYYY h:mm A&#039;,
    };

    function longDateFormat(key) {
        var format = this._longDateFormat[key],
            formatUpper = this._longDateFormat[key.toUpperCase()];

        if (format || !formatUpper) {
            return format;
        }

        this._longDateFormat[key] = formatUpper
            .match(formattingTokens)
            .map(function (tok) {
                if (
                    tok === &#039;MMMM&#039; ||
                    tok === &#039;MM&#039; ||
                    tok === &#039;DD&#039; ||
                    tok === &#039;dddd&#039;
                ) {
                    return tok.slice(1);
                }
                return tok;
            })
            .join(&#039;&#039;);

        return this._longDateFormat[key];
    }

    var defaultInvalidDate = &#039;Invalid date&#039;;

    function invalidDate() {
        return this._invalidDate;
    }

    var defaultOrdinal = &#039;%d&#039;,
        defaultDayOfMonthOrdinalParse = /\d{1,2}/;

    function ordinal(number) {
        return this._ordinal.replace(&#039;%d&#039;, number);
    }

    var defaultRelativeTime = {
        future: &#039;in %s&#039;,
        past: &#039;%s ago&#039;,
        s: &#039;a few seconds&#039;,
        ss: &#039;%d seconds&#039;,
        m: &#039;a minute&#039;,
        mm: &#039;%d minutes&#039;,
        h: &#039;an hour&#039;,
        hh: &#039;%d hours&#039;,
        d: &#039;a day&#039;,
        dd: &#039;%d days&#039;,
        w: &#039;a week&#039;,
        ww: &#039;%d weeks&#039;,
        M: &#039;a month&#039;,
        MM: &#039;%d months&#039;,
        y: &#039;a year&#039;,
        yy: &#039;%d years&#039;,
    };

    function relativeTime(number, withoutSuffix, string, isFuture) {
        var output = this._relativeTime[string];
        return isFunction(output)
            ? output(number, withoutSuffix, string, isFuture)
            : output.replace(/%d/i, number);
    }

    function pastFuture(diff, output) {
        var format = this._relativeTime[diff &gt; 0 ? &#039;future&#039; : &#039;past&#039;];
        return isFunction(format) ? format(output) : format.replace(/%s/i, output);
    }

    var aliases = {
        D: &#039;date&#039;,
        dates: &#039;date&#039;,
        date: &#039;date&#039;,
        d: &#039;day&#039;,
        days: &#039;day&#039;,
        day: &#039;day&#039;,
        e: &#039;weekday&#039;,
        weekdays: &#039;weekday&#039;,
        weekday: &#039;weekday&#039;,
        E: &#039;isoWeekday&#039;,
        isoweekdays: &#039;isoWeekday&#039;,
        isoweekday: &#039;isoWeekday&#039;,
        DDD: &#039;dayOfYear&#039;,
        dayofyears: &#039;dayOfYear&#039;,
        dayofyear: &#039;dayOfYear&#039;,
        h: &#039;hour&#039;,
        hours: &#039;hour&#039;,
        hour: &#039;hour&#039;,
        ms: &#039;millisecond&#039;,
        milliseconds: &#039;millisecond&#039;,
        millisecond: &#039;millisecond&#039;,
        m: &#039;minute&#039;,
        minutes: &#039;minute&#039;,
        minute: &#039;minute&#039;,
        M: &#039;month&#039;,
        months: &#039;month&#039;,
        month: &#039;month&#039;,
        Q: &#039;quarter&#039;,
        quarters: &#039;quarter&#039;,
        quarter: &#039;quarter&#039;,
        s: &#039;second&#039;,
        seconds: &#039;second&#039;,
        second: &#039;second&#039;,
        gg: &#039;weekYear&#039;,
        weekyears: &#039;weekYear&#039;,
        weekyear: &#039;weekYear&#039;,
        GG: &#039;isoWeekYear&#039;,
        isoweekyears: &#039;isoWeekYear&#039;,
        isoweekyear: &#039;isoWeekYear&#039;,
        w: &#039;week&#039;,
        weeks: &#039;week&#039;,
        week: &#039;week&#039;,
        W: &#039;isoWeek&#039;,
        isoweeks: &#039;isoWeek&#039;,
        isoweek: &#039;isoWeek&#039;,
        y: &#039;year&#039;,
        years: &#039;year&#039;,
        year: &#039;year&#039;,
    };

    function normalizeUnits(units) {
        return typeof units === &#039;string&#039;
            ? aliases[units] || aliases[units.toLowerCase()]
            : undefined;
    }

    function normalizeObjectUnits(inputObject) {
        var normalizedInput = {},
            normalizedProp,
            prop;

        for (prop in inputObject) {
            if (hasOwnProp(inputObject, prop)) {
                normalizedProp = normalizeUnits(prop);
                if (normalizedProp) {
                    normalizedInput[normalizedProp] = inputObject[prop];
                }
            }
        }

        return normalizedInput;
    }

    var priorities = {
        date: 9,
        day: 11,
        weekday: 11,
        isoWeekday: 11,
        dayOfYear: 4,
        hour: 13,
        millisecond: 16,
        minute: 14,
        month: 8,
        quarter: 7,
        second: 15,
        weekYear: 1,
        isoWeekYear: 1,
        week: 5,
        isoWeek: 5,
        year: 1,
    };

    function getPrioritizedUnits(unitsObj) {
        var units = [],
            u;
        for (u in unitsObj) {
            if (hasOwnProp(unitsObj, u)) {
                units.push({ unit: u, priority: priorities[u] });
            }
        }
        units.sort(function (a, b) {
            return a.priority - b.priority;
        });
        return units;
    }

    var match1 = /\d/, //       0 - 9
        match2 = /\d\d/, //      00 - 99
        match3 = /\d{3}/, //     000 - 999
        match4 = /\d{4}/, //    0000 - 9999
        match6 = /[+-]?\d{6}/, // -999999 - 999999
        match1to2 = /\d\d?/, //       0 - 99
        match3to4 = /\d\d\d\d?/, //     999 - 9999
        match5to6 = /\d\d\d\d\d\d?/, //   99999 - 999999
        match1to3 = /\d{1,3}/, //       0 - 999
        match1to4 = /\d{1,4}/, //       0 - 9999
        match1to6 = /[+-]?\d{1,6}/, // -999999 - 999999
        matchUnsigned = /\d+/, //       0 - inf
        matchSigned = /[+-]?\d+/, //    -inf - inf
        matchOffset = /Z|[+-]\d\d:?\d\d/gi, // +00:00 -00:00 +0000 -0000 or Z
        matchShortOffset = /Z|[+-]\d\d(?::?\d\d)?/gi, // +00 -00 +00:00 -00:00 +0000 -0000 or Z
        matchTimestamp = /[+-]?\d+(\.\d{1,3})?/, // 123456789 123456789.123
        // any word (or two) characters or numbers including two/three word month in arabic.
        // includes scottish gaelic two word and hyphenated months
        matchWord =
            /[0-9]{0,256}[&#039;a-z\u00A0-\u05FF\u0700-\uD7FF\uF900-\uFDCF\uFDF0-\uFF07\uFF10-\uFFEF]{1,256}|[\u0600-\u06FF\/]{1,256}(\s*?[\u0600-\u06FF]{1,256}){1,2}/i,
        match1to2NoLeadingZero = /^[1-9]\d?/, //         1-99
        match1to2HasZero = /^([1-9]\d|\d)/, //           0-99
        regexes;

    regexes = {};

    function addRegexToken(token, regex, strictRegex) {
        regexes[token] = isFunction(regex)
            ? regex
            : function (isStrict, localeData) {
                  return isStrict &amp;&amp; strictRegex ? strictRegex : regex;
              };
    }

    function getParseRegexForToken(token, config) {
        if (!hasOwnProp(regexes, token)) {
            return new RegExp(unescapeFormat(token));
        }

        return regexes[token](config._strict, config._locale);
    }

    // Code from http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
    function unescapeFormat(s) {
        return regexEscape(
            s
                .replace(&#039;\\&#039;, &#039;&#039;)
                .replace(
                    /\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g,
                    function (matched, p1, p2, p3, p4) {
                        return p1 || p2 || p3 || p4;
                    }
                )
        );
    }

    function regexEscape(s) {
        return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, &#039;\\$&amp;&#039;);
    }

    function absFloor(number) {
        if (number &lt; 0) {
            // -0 -&gt; 0
            return Math.ceil(number) || 0;
        } else {
            return Math.floor(number);
        }
    }

    function toInt(argumentForCoercion) {
        var coercedNumber = +argumentForCoercion,
            value = 0;

        if (coercedNumber !== 0 &amp;&amp; isFinite(coercedNumber)) {
            value = absFloor(coercedNumber);
        }

        return value;
    }

    var tokens = {};

    function addParseToken(token, callback) {
        var i,
            func = callback,
            tokenLen;
        if (typeof token === &#039;string&#039;) {
            token = [token];
        }
        if (isNumber(callback)) {
            func = function (input, array) {
                array[callback] = toInt(input);
            };
        }
        tokenLen = token.length;
        for (i = 0; i &lt; tokenLen; i++) {
            tokens[token[i]] = func;
        }
    }

    function addWeekParseToken(token, callback) {
        addParseToken(token, function (input, array, config, token) {
            config._w = config._w || {};
            callback(input, config._w, config, token);
        });
    }

    function addTimeToArrayFromToken(token, input, config) {
        if (input != null &amp;&amp; hasOwnProp(tokens, token)) {
            tokens[token](input, config._a, config, token);
        }
    }

    function isLeapYear(year) {
        return (year % 4 === 0 &amp;&amp; year % 100 !== 0) || year % 400 === 0;
    }

    var YEAR = 0,
        MONTH = 1,
        DATE = 2,
        HOUR = 3,
        MINUTE = 4,
        SECOND = 5,
        MILLISECOND = 6,
        WEEK = 7,
        WEEKDAY = 8;

    // FORMATTING

    addFormatToken(&#039;Y&#039;, 0, 0, function () {
        var y = this.year();
        return y &lt;= 9999 ? zeroFill(y, 4) : &#039;+&#039; + y;
    });

    addFormatToken(0, [&#039;YY&#039;, 2], 0, function () {
        return this.year() % 100;
    });

    addFormatToken(0, [&#039;YYYY&#039;, 4], 0, &#039;year&#039;);
    addFormatToken(0, [&#039;YYYYY&#039;, 5], 0, &#039;year&#039;);
    addFormatToken(0, [&#039;YYYYYY&#039;, 6, true], 0, &#039;year&#039;);

    // PARSING

    addRegexToken(&#039;Y&#039;, matchSigned);
    addRegexToken(&#039;YY&#039;, match1to2, match2);
    addRegexToken(&#039;YYYY&#039;, match1to4, match4);
    addRegexToken(&#039;YYYYY&#039;, match1to6, match6);
    addRegexToken(&#039;YYYYYY&#039;, match1to6, match6);

    addParseToken([&#039;YYYYY&#039;, &#039;YYYYYY&#039;], YEAR);
    addParseToken(&#039;YYYY&#039;, function (input, array) {
        array[YEAR] =
            input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input);
    });
    addParseToken(&#039;YY&#039;, function (input, array) {
        array[YEAR] = hooks.parseTwoDigitYear(input);
    });
    addParseToken(&#039;Y&#039;, function (input, array) {
        array[YEAR] = parseInt(input, 10);
    });

    // HELPERS

    function daysInYear(year) {
        return isLeapYear(year) ? 366 : 365;
    }

    // HOOKS

    hooks.parseTwoDigitYear = function (input) {
        return toInt(input) + (toInt(input) &gt; 68 ? 1900 : 2000);
    };

    // MOMENTS

    var getSetYear = makeGetSet(&#039;FullYear&#039;, true);

    function getIsLeapYear() {
        return isLeapYear(this.year());
    }

    function makeGetSet(unit, keepTime) {
        return function (value) {
            if (value != null) {
                set$1(this, unit, value);
                hooks.updateOffset(this, keepTime);
                return this;
            } else {
                return get(this, unit);
            }
        };
    }

    function get(mom, unit) {
        if (!mom.isValid()) {
            return NaN;
        }

        var d = mom._d,
            isUTC = mom._isUTC;

        switch (unit) {
            case &#039;Milliseconds&#039;:
                return isUTC ? d.getUTCMilliseconds() : d.getMilliseconds();
            case &#039;Seconds&#039;:
                return isUTC ? d.getUTCSeconds() : d.getSeconds();
            case &#039;Minutes&#039;:
                return isUTC ? d.getUTCMinutes() : d.getMinutes();
            case &#039;Hours&#039;:
                return isUTC ? d.getUTCHours() : d.getHours();
            case &#039;Date&#039;:
                return isUTC ? d.getUTCDate() : d.getDate();
            case &#039;Day&#039;:
                return isUTC ? d.getUTCDay() : d.getDay();
            case &#039;Month&#039;:
                return isUTC ? d.getUTCMonth() : d.getMonth();
            case &#039;FullYear&#039;:
                return isUTC ? d.getUTCFullYear() : d.getFullYear();
            default:
                return NaN; // Just in case
        }
    }

    function set$1(mom, unit, value) {
        var d, isUTC, year, month, date;

        if (!mom.isValid() || isNaN(value)) {
            return;
        }

        d = mom._d;
        isUTC = mom._isUTC;

        switch (unit) {
            case &#039;Milliseconds&#039;:
                return void (isUTC
                    ? d.setUTCMilliseconds(value)
                    : d.setMilliseconds(value));
            case &#039;Seconds&#039;:
                return void (isUTC ? d.setUTCSeconds(value) : d.setSeconds(value));
            case &#039;Minutes&#039;:
                return void (isUTC ? d.setUTCMinutes(value) : d.setMinutes(value));
            case &#039;Hours&#039;:
                return void (isUTC ? d.setUTCHours(value) : d.setHours(value));
            case &#039;Date&#039;:
                return void (isUTC ? d.setUTCDate(value) : d.setDate(value));
            // case &#039;Day&#039;: // Not real
            //    return void (isUTC ? d.setUTCDay(value) : d.setDay(value));
            // case &#039;Month&#039;: // Not used because we need to pass two variables
            //     return void (isUTC ? d.setUTCMonth(value) : d.setMonth(value));
            case &#039;FullYear&#039;:
                break; // See below ...
            default:
                return; // Just in case
        }

        year = value;
        month = mom.month();
        date = mom.date();
        date = date === 29 &amp;&amp; month === 1 &amp;&amp; !isLeapYear(year) ? 28 : date;
        void (isUTC
            ? d.setUTCFullYear(year, month, date)
            : d.setFullYear(year, month, date));
    }

    // MOMENTS

    function stringGet(units) {
        units = normalizeUnits(units);
        if (isFunction(this[units])) {
            return this[units]();
        }
        return this;
    }

    function stringSet(units, value) {
        if (typeof units === &#039;object&#039;) {
            units = normalizeObjectUnits(units);
            var prioritized = getPrioritizedUnits(units),
                i,
                prioritizedLen = prioritized.length;
            for (i = 0; i &lt; prioritizedLen; i++) {
                this[prioritized[i].unit](units[prioritized[i].unit]);
            }
        } else {
            units = normalizeUnits(units);
            if (isFunction(this[units])) {
                return this[units](value);
            }
        }
        return this;
    }

    function mod(n, x) {
        return ((n % x) + x) % x;
    }

    var indexOf;

    if (Array.prototype.indexOf) {
        indexOf = Array.prototype.indexOf;
    } else {
        indexOf = function (o) {
            // I know
            var i;
            for (i = 0; i &lt; this.length; ++i) {
                if (this[i] === o) {
                    return i;
                }
            }
            return -1;
        };
    }

    function daysInMonth(year, month) {
        if (isNaN(year) || isNaN(month)) {
            return NaN;
        }
        var modMonth = mod(month, 12);
        year += (month - modMonth) / 12;
        return modMonth === 1
            ? isLeapYear(year)
                ? 29
                : 28
            : 31 - ((modMonth % 7) % 2);
    }

    // FORMATTING

    addFormatToken(&#039;M&#039;, [&#039;MM&#039;, 2], &#039;Mo&#039;, function () {
        return this.month() + 1;
    });

    addFormatToken(&#039;MMM&#039;, 0, 0, function (format) {
        return this.localeData().monthsShort(this, format);
    });

    addFormatToken(&#039;MMMM&#039;, 0, 0, function (format) {
        return this.localeData().months(this, format);
    });

    // PARSING

    addRegexToken(&#039;M&#039;, match1to2, match1to2NoLeadingZero);
    addRegexToken(&#039;MM&#039;, match1to2, match2);
    addRegexToken(&#039;MMM&#039;, function (isStrict, locale) {
        return locale.monthsShortRegex(isStrict);
    });
    addRegexToken(&#039;MMMM&#039;, function (isStrict, locale) {
        return locale.monthsRegex(isStrict);
    });

    addParseToken([&#039;M&#039;, &#039;MM&#039;], function (input, array) {
        array[MONTH] = toInt(input) - 1;
    });

    addParseToken([&#039;MMM&#039;, &#039;MMMM&#039;], function (input, array, config, token) {
        var month = config._locale.monthsParse(input, token, config._strict);
        // if we didn&#039;t find a month name, mark the date as invalid.
        if (month != null) {
            array[MONTH] = month;
        } else {
            getParsingFlags(config).invalidMonth = input;
        }
    });

    // LOCALES

    var defaultLocaleMonths =
            &#039;January_February_March_April_May_June_July_August_September_October_November_December&#039;.split(
                &#039;_&#039;
            ),
        defaultLocaleMonthsShort =
            &#039;Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec&#039;.split(&#039;_&#039;),
        MONTHS_IN_FORMAT = /D[oD]?(\[[^\[\]]*\]|\s)+MMMM?/,
        defaultMonthsShortRegex = matchWord,
        defaultMonthsRegex = matchWord;

    function localeMonths(m, format) {
        if (!m) {
            return isArray(this._months)
                ? this._months
                : this._months[&#039;standalone&#039;];
        }
        return isArray(this._months)
            ? this._months[m.month()]
            : this._months[
                  (this._months.isFormat || MONTHS_IN_FORMAT).test(format)
                      ? &#039;format&#039;
                      : &#039;standalone&#039;
              ][m.month()];
    }

    function localeMonthsShort(m, format) {
        if (!m) {
            return isArray(this._monthsShort)
                ? this._monthsShort
                : this._monthsShort[&#039;standalone&#039;];
        }
        return isArray(this._monthsShort)
            ? this._monthsShort[m.month()]
            : this._monthsShort[
                  MONTHS_IN_FORMAT.test(format) ? &#039;format&#039; : &#039;standalone&#039;
              ][m.month()];
    }

    function handleStrictParse(monthName, format, strict) {
        var i,
            ii,
            mom,
            llc = monthName.toLocaleLowerCase();
        if (!this._monthsParse) {
            // this is not used
            this._monthsParse = [];
            this._longMonthsParse = [];
            this._shortMonthsParse = [];
            for (i = 0; i &lt; 12; ++i) {
                mom = createUTC([2000, i]);
                this._shortMonthsParse[i] = this.monthsShort(
                    mom,
                    &#039;&#039;
                ).toLocaleLowerCase();
                this._longMonthsParse[i] = this.months(mom, &#039;&#039;).toLocaleLowerCase();
            }
        }

        if (strict) {
            if (format === &#039;MMM&#039;) {
                ii = indexOf.call(this._shortMonthsParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._longMonthsParse, llc);
                return ii !== -1 ? ii : null;
            }
        } else {
            if (format === &#039;MMM&#039;) {
                ii = indexOf.call(this._shortMonthsParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._longMonthsParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._longMonthsParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._shortMonthsParse, llc);
                return ii !== -1 ? ii : null;
            }
        }
    }

    function localeMonthsParse(monthName, format, strict) {
        var i, mom, regex;

        if (this._monthsParseExact) {
            return handleStrictParse.call(this, monthName, format, strict);
        }

        if (!this._monthsParse) {
            this._monthsParse = [];
            this._longMonthsParse = [];
            this._shortMonthsParse = [];
        }

        // TODO: add sorting
        // Sorting makes sure if one month (or abbr) is a prefix of another
        // see sorting in computeMonthsParse
        for (i = 0; i &lt; 12; i++) {
            // make the regex if we don&#039;t have it already
            mom = createUTC([2000, i]);
            if (strict &amp;&amp; !this._longMonthsParse[i]) {
                this._longMonthsParse[i] = new RegExp(
                    &#039;^&#039; + this.months(mom, &#039;&#039;).replace(&#039;.&#039;, &#039;&#039;) + &#039;$&#039;,
                    &#039;i&#039;
                );
                this._shortMonthsParse[i] = new RegExp(
                    &#039;^&#039; + this.monthsShort(mom, &#039;&#039;).replace(&#039;.&#039;, &#039;&#039;) + &#039;$&#039;,
                    &#039;i&#039;
                );
            }
            if (!strict &amp;&amp; !this._monthsParse[i]) {
                regex =
                    &#039;^&#039; + this.months(mom, &#039;&#039;) + &#039;|^&#039; + this.monthsShort(mom, &#039;&#039;);
                this._monthsParse[i] = new RegExp(regex.replace(&#039;.&#039;, &#039;&#039;), &#039;i&#039;);
            }
            // test the regex
            if (
                strict &amp;&amp;
                format === &#039;MMMM&#039; &amp;&amp;
                this._longMonthsParse[i].test(monthName)
            ) {
                return i;
            } else if (
                strict &amp;&amp;
                format === &#039;MMM&#039; &amp;&amp;
                this._shortMonthsParse[i].test(monthName)
            ) {
                return i;
            } else if (!strict &amp;&amp; this._monthsParse[i].test(monthName)) {
                return i;
            }
        }
    }

    // MOMENTS

    function setMonth(mom, value) {
        if (!mom.isValid()) {
            // No op
            return mom;
        }

        if (typeof value === &#039;string&#039;) {
            if (/^\d+$/.test(value)) {
                value = toInt(value);
            } else {
                value = mom.localeData().monthsParse(value);
                // TODO: Another silent failure?
                if (!isNumber(value)) {
                    return mom;
                }
            }
        }

        var month = value,
            date = mom.date();

        date = date &lt; 29 ? date : Math.min(date, daysInMonth(mom.year(), month));
        void (mom._isUTC
            ? mom._d.setUTCMonth(month, date)
            : mom._d.setMonth(month, date));
        return mom;
    }

    function getSetMonth(value) {
        if (value != null) {
            setMonth(this, value);
            hooks.updateOffset(this, true);
            return this;
        } else {
            return get(this, &#039;Month&#039;);
        }
    }

    function getDaysInMonth() {
        return daysInMonth(this.year(), this.month());
    }

    function monthsShortRegex(isStrict) {
        if (this._monthsParseExact) {
            if (!hasOwnProp(this, &#039;_monthsRegex&#039;)) {
                computeMonthsParse.call(this);
            }
            if (isStrict) {
                return this._monthsShortStrictRegex;
            } else {
                return this._monthsShortRegex;
            }
        } else {
            if (!hasOwnProp(this, &#039;_monthsShortRegex&#039;)) {
                this._monthsShortRegex = defaultMonthsShortRegex;
            }
            return this._monthsShortStrictRegex &amp;&amp; isStrict
                ? this._monthsShortStrictRegex
                : this._monthsShortRegex;
        }
    }

    function monthsRegex(isStrict) {
        if (this._monthsParseExact) {
            if (!hasOwnProp(this, &#039;_monthsRegex&#039;)) {
                computeMonthsParse.call(this);
            }
            if (isStrict) {
                return this._monthsStrictRegex;
            } else {
                return this._monthsRegex;
            }
        } else {
            if (!hasOwnProp(this, &#039;_monthsRegex&#039;)) {
                this._monthsRegex = defaultMonthsRegex;
            }
            return this._monthsStrictRegex &amp;&amp; isStrict
                ? this._monthsStrictRegex
                : this._monthsRegex;
        }
    }

    function computeMonthsParse() {
        function cmpLenRev(a, b) {
            return b.length - a.length;
        }

        var shortPieces = [],
            longPieces = [],
            mixedPieces = [],
            i,
            mom,
            shortP,
            longP;
        for (i = 0; i &lt; 12; i++) {
            // make the regex if we don&#039;t have it already
            mom = createUTC([2000, i]);
            shortP = regexEscape(this.monthsShort(mom, &#039;&#039;));
            longP = regexEscape(this.months(mom, &#039;&#039;));
            shortPieces.push(shortP);
            longPieces.push(longP);
            mixedPieces.push(longP);
            mixedPieces.push(shortP);
        }
        // Sorting makes sure if one month (or abbr) is a prefix of another it
        // will match the longer piece.
        shortPieces.sort(cmpLenRev);
        longPieces.sort(cmpLenRev);
        mixedPieces.sort(cmpLenRev);

        this._monthsRegex = new RegExp(&#039;^(&#039; + mixedPieces.join(&#039;|&#039;) + &#039;)&#039;, &#039;i&#039;);
        this._monthsShortRegex = this._monthsRegex;
        this._monthsStrictRegex = new RegExp(
            &#039;^(&#039; + longPieces.join(&#039;|&#039;) + &#039;)&#039;,
            &#039;i&#039;
        );
        this._monthsShortStrictRegex = new RegExp(
            &#039;^(&#039; + shortPieces.join(&#039;|&#039;) + &#039;)&#039;,
            &#039;i&#039;
        );
    }

    function createDate(y, m, d, h, M, s, ms) {
        // can&#039;t just apply() to create a date:
        // https://stackoverflow.com/q/181348
        var date;
        // the date constructor remaps years 0-99 to 1900-1999
        if (y &lt; 100 &amp;&amp; y &gt;= 0) {
            // preserve leap years using a full 400 year cycle, then reset
            date = new Date(y + 400, m, d, h, M, s, ms);
            if (isFinite(date.getFullYear())) {
                date.setFullYear(y);
            }
        } else {
            date = new Date(y, m, d, h, M, s, ms);
        }

        return date;
    }

    function createUTCDate(y) {
        var date, args;
        // the Date.UTC function remaps years 0-99 to 1900-1999
        if (y &lt; 100 &amp;&amp; y &gt;= 0) {
            args = Array.prototype.slice.call(arguments);
            // preserve leap years using a full 400 year cycle, then reset
            args[0] = y + 400;
            date = new Date(Date.UTC.apply(null, args));
            if (isFinite(date.getUTCFullYear())) {
                date.setUTCFullYear(y);
            }
        } else {
            date = new Date(Date.UTC.apply(null, arguments));
        }

        return date;
    }

    // start-of-first-week - start-of-year
    function firstWeekOffset(year, dow, doy) {
        var // first-week day -- which january is always in the first week (4 for iso, 1 for other)
            fwd = 7 + dow - doy,
            // first-week day local weekday -- which local weekday is fwd
            fwdlw = (7 + createUTCDate(year, 0, fwd).getUTCDay() - dow) % 7;

        return -fwdlw + fwd - 1;
    }

    // https://en.wikipedia.org/wiki/ISO_week_date#Calculating_a_date_given_the_year.2C_week_number_and_weekday
    function dayOfYearFromWeeks(year, week, weekday, dow, doy) {
        var localWeekday = (7 + weekday - dow) % 7,
            weekOffset = firstWeekOffset(year, dow, doy),
            dayOfYear = 1 + 7 * (week - 1) + localWeekday + weekOffset,
            resYear,
            resDayOfYear;

        if (dayOfYear &lt;= 0) {
            resYear = year - 1;
            resDayOfYear = daysInYear(resYear) + dayOfYear;
        } else if (dayOfYear &gt; daysInYear(year)) {
            resYear = year + 1;
            resDayOfYear = dayOfYear - daysInYear(year);
        } else {
            resYear = year;
            resDayOfYear = dayOfYear;
        }

        return {
            year: resYear,
            dayOfYear: resDayOfYear,
        };
    }

    function weekOfYear(mom, dow, doy) {
        var weekOffset = firstWeekOffset(mom.year(), dow, doy),
            week = Math.floor((mom.dayOfYear() - weekOffset - 1) / 7) + 1,
            resWeek,
            resYear;

        if (week &lt; 1) {
            resYear = mom.year() - 1;
            resWeek = week + weeksInYear(resYear, dow, doy);
        } else if (week &gt; weeksInYear(mom.year(), dow, doy)) {
            resWeek = week - weeksInYear(mom.year(), dow, doy);
            resYear = mom.year() + 1;
        } else {
            resYear = mom.year();
            resWeek = week;
        }

        return {
            week: resWeek,
            year: resYear,
        };
    }

    function weeksInYear(year, dow, doy) {
        var weekOffset = firstWeekOffset(year, dow, doy),
            weekOffsetNext = firstWeekOffset(year + 1, dow, doy);
        return (daysInYear(year) - weekOffset + weekOffsetNext) / 7;
    }

    // FORMATTING

    addFormatToken(&#039;w&#039;, [&#039;ww&#039;, 2], &#039;wo&#039;, &#039;week&#039;);
    addFormatToken(&#039;W&#039;, [&#039;WW&#039;, 2], &#039;Wo&#039;, &#039;isoWeek&#039;);

    // PARSING

    addRegexToken(&#039;w&#039;, match1to2, match1to2NoLeadingZero);
    addRegexToken(&#039;ww&#039;, match1to2, match2);
    addRegexToken(&#039;W&#039;, match1to2, match1to2NoLeadingZero);
    addRegexToken(&#039;WW&#039;, match1to2, match2);

    addWeekParseToken(
        [&#039;w&#039;, &#039;ww&#039;, &#039;W&#039;, &#039;WW&#039;],
        function (input, week, config, token) {
            week[token.substr(0, 1)] = toInt(input);
        }
    );

    // HELPERS

    // LOCALES

    function localeWeek(mom) {
        return weekOfYear(mom, this._week.dow, this._week.doy).week;
    }

    var defaultLocaleWeek = {
        dow: 0, // Sunday is the first day of the week.
        doy: 6, // The week that contains Jan 6th is the first week of the year.
    };

    function localeFirstDayOfWeek() {
        return this._week.dow;
    }

    function localeFirstDayOfYear() {
        return this._week.doy;
    }

    // MOMENTS

    function getSetWeek(input) {
        var week = this.localeData().week(this);
        return input == null ? week : this.add((input - week) * 7, &#039;d&#039;);
    }

    function getSetISOWeek(input) {
        var week = weekOfYear(this, 1, 4).week;
        return input == null ? week : this.add((input - week) * 7, &#039;d&#039;);
    }

    // FORMATTING

    addFormatToken(&#039;d&#039;, 0, &#039;do&#039;, &#039;day&#039;);

    addFormatToken(&#039;dd&#039;, 0, 0, function (format) {
        return this.localeData().weekdaysMin(this, format);
    });

    addFormatToken(&#039;ddd&#039;, 0, 0, function (format) {
        return this.localeData().weekdaysShort(this, format);
    });

    addFormatToken(&#039;dddd&#039;, 0, 0, function (format) {
        return this.localeData().weekdays(this, format);
    });

    addFormatToken(&#039;e&#039;, 0, 0, &#039;weekday&#039;);
    addFormatToken(&#039;E&#039;, 0, 0, &#039;isoWeekday&#039;);

    // PARSING

    addRegexToken(&#039;d&#039;, match1to2);
    addRegexToken(&#039;e&#039;, match1to2);
    addRegexToken(&#039;E&#039;, match1to2);
    addRegexToken(&#039;dd&#039;, function (isStrict, locale) {
        return locale.weekdaysMinRegex(isStrict);
    });
    addRegexToken(&#039;ddd&#039;, function (isStrict, locale) {
        return locale.weekdaysShortRegex(isStrict);
    });
    addRegexToken(&#039;dddd&#039;, function (isStrict, locale) {
        return locale.weekdaysRegex(isStrict);
    });

    addWeekParseToken([&#039;dd&#039;, &#039;ddd&#039;, &#039;dddd&#039;], function (input, week, config, token) {
        var weekday = config._locale.weekdaysParse(input, token, config._strict);
        // if we didn&#039;t get a weekday name, mark the date as invalid
        if (weekday != null) {
            week.d = weekday;
        } else {
            getParsingFlags(config).invalidWeekday = input;
        }
    });

    addWeekParseToken([&#039;d&#039;, &#039;e&#039;, &#039;E&#039;], function (input, week, config, token) {
        week[token] = toInt(input);
    });

    // HELPERS

    function parseWeekday(input, locale) {
        if (typeof input !== &#039;string&#039;) {
            return input;
        }

        if (!isNaN(input)) {
            return parseInt(input, 10);
        }

        input = locale.weekdaysParse(input);
        if (typeof input === &#039;number&#039;) {
            return input;
        }

        return null;
    }

    function parseIsoWeekday(input, locale) {
        if (typeof input === &#039;string&#039;) {
            return locale.weekdaysParse(input) % 7 || 7;
        }
        return isNaN(input) ? null : input;
    }

    // LOCALES
    function shiftWeekdays(ws, n) {
        return ws.slice(n, 7).concat(ws.slice(0, n));
    }

    var defaultLocaleWeekdays =
            &#039;Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday&#039;.split(&#039;_&#039;),
        defaultLocaleWeekdaysShort = &#039;Sun_Mon_Tue_Wed_Thu_Fri_Sat&#039;.split(&#039;_&#039;),
        defaultLocaleWeekdaysMin = &#039;Su_Mo_Tu_We_Th_Fr_Sa&#039;.split(&#039;_&#039;),
        defaultWeekdaysRegex = matchWord,
        defaultWeekdaysShortRegex = matchWord,
        defaultWeekdaysMinRegex = matchWord;

    function localeWeekdays(m, format) {
        var weekdays = isArray(this._weekdays)
            ? this._weekdays
            : this._weekdays[
                  m &amp;&amp; m !== true &amp;&amp; this._weekdays.isFormat.test(format)
                      ? &#039;format&#039;
                      : &#039;standalone&#039;
              ];
        return m === true
            ? shiftWeekdays(weekdays, this._week.dow)
            : m
              ? weekdays[m.day()]
              : weekdays;
    }

    function localeWeekdaysShort(m) {
        return m === true
            ? shiftWeekdays(this._weekdaysShort, this._week.dow)
            : m
              ? this._weekdaysShort[m.day()]
              : this._weekdaysShort;
    }

    function localeWeekdaysMin(m) {
        return m === true
            ? shiftWeekdays(this._weekdaysMin, this._week.dow)
            : m
              ? this._weekdaysMin[m.day()]
              : this._weekdaysMin;
    }

    function handleStrictParse$1(weekdayName, format, strict) {
        var i,
            ii,
            mom,
            llc = weekdayName.toLocaleLowerCase();
        if (!this._weekdaysParse) {
            this._weekdaysParse = [];
            this._shortWeekdaysParse = [];
            this._minWeekdaysParse = [];

            for (i = 0; i &lt; 7; ++i) {
                mom = createUTC([2000, 1]).day(i);
                this._minWeekdaysParse[i] = this.weekdaysMin(
                    mom,
                    &#039;&#039;
                ).toLocaleLowerCase();
                this._shortWeekdaysParse[i] = this.weekdaysShort(
                    mom,
                    &#039;&#039;
                ).toLocaleLowerCase();
                this._weekdaysParse[i] = this.weekdays(mom, &#039;&#039;).toLocaleLowerCase();
            }
        }

        if (strict) {
            if (format === &#039;dddd&#039;) {
                ii = indexOf.call(this._weekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else if (format === &#039;ddd&#039;) {
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._minWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            }
        } else {
            if (format === &#039;dddd&#039;) {
                ii = indexOf.call(this._weekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._minWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else if (format === &#039;ddd&#039;) {
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._weekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._minWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            } else {
                ii = indexOf.call(this._minWeekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._weekdaysParse, llc);
                if (ii !== -1) {
                    return ii;
                }
                ii = indexOf.call(this._shortWeekdaysParse, llc);
                return ii !== -1 ? ii : null;
            }
        }
    }

    function localeWeekdaysParse(weekdayName, format, strict) {
        var i, mom, regex;

        if (this._weekdaysParseExact) {
            return handleStrictParse$1.call(this, weekdayName, format, strict);
        }

        if (!this._weekdaysParse) {
            this._weekdaysParse = [];
            this._minWeekdaysParse = [];
            this._shortWeekdaysParse = [];
            this._fullWeekdaysParse = [];
        }

        for (i = 0; i &lt; 7; i++) {
            // make the regex if we don&#039;t have it already

            mom = createUTC([2000, 1]).day(i);
            if (strict &amp;&amp; !this._fullWeekdaysParse[i]) {
                this._fullWeekdaysParse[i] = new RegExp(
                    &#039;^&#039; + this.weekdays(mom, &#039;&#039;).replace(&#039;.&#039;, &#039;\\.?&#039;) + &#039;$&#039;,
                    &#039;i&#039;
                );
                this._shortWeekdaysParse[i] = new RegExp(
                    &#039;^&#039; + this.weekdaysShort(mom, &#039;&#039;).replace(&#039;.&#039;, &#039;\\.?&#039;) + &#039;$&#039;,
                    &#039;i&#039;
                );
                this._minWeekdaysParse[i] = new RegExp(
                    &#039;^&#039; + this.weekdaysMin(mom, &#039;&#039;).replace(&#039;.&#039;, &#039;\\.?&#039;) + &#039;$&#039;,
                    &#039;i&#039;
                );
            }
            if (!this._weekdaysParse[i]) {
                regex =
                    &#039;^&#039; +
                    this.weekdays(mom, &#039;&#039;) +
                    &#039;|^&#039; +
                    this.weekdaysShort(mom, &#039;&#039;) +
                    &#039;|^&#039; +
                    this.weekdaysMin(mom, &#039;&#039;);
                this._weekdaysParse[i] = new RegExp(regex.replace(&#039;.&#039;, &#039;&#039;), &#039;i&#039;);
            }
            // test the regex
            if (
                strict &amp;&amp;
                format === &#039;dddd&#039; &amp;&amp;
                this._fullWeekdaysParse[i].test(weekdayName)
            ) {
                return i;
            } else if (
                strict &amp;&amp;
                format === &#039;ddd&#039; &amp;&amp;
                this._shortWeekdaysParse[i].test(weekdayName)
            ) {
                return i;
            } else if (
                strict &amp;&amp;
                format === &#039;dd&#039; &amp;&amp;
                this._minWeekdaysParse[i].test(weekdayName)
            ) {
                return i;
            } else if (!strict &amp;&amp; this._weekdaysParse[i].test(weekdayName)) {
                return i;
            }
        }
    }

    // MOMENTS

    function getSetDayOfWeek(input) {
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }

        var day = get(this, &#039;Day&#039;);
        if (input != null) {
            input = parseWeekday(input, this.localeData());
            return this.add(input - day, &#039;d&#039;);
        } else {
            return day;
        }
    }

    function getSetLocaleDayOfWeek(input) {
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }
        var weekday = (this.day() + 7 - this.localeData()._week.dow) % 7;
        return input == null ? weekday : this.add(input - weekday, &#039;d&#039;);
    }

    function getSetISODayOfWeek(input) {
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }

        // behaves the same as moment#day except
        // as a getter, returns 7 instead of 0 (1-7 range instead of 0-6)
        // as a setter, sunday should belong to the previous week.

        if (input != null) {
            var weekday = parseIsoWeekday(input, this.localeData());
            return this.day(this.day() % 7 ? weekday : weekday - 7);
        } else {
            return this.day() || 7;
        }
    }

    function weekdaysRegex(isStrict) {
        if (this._weekdaysParseExact) {
            if (!hasOwnProp(this, &#039;_weekdaysRegex&#039;)) {
                computeWeekdaysParse.call(this);
            }
            if (isStrict) {
                return this._weekdaysStrictRegex;
            } else {
                return this._weekdaysRegex;
            }
        } else {
            if (!hasOwnProp(this, &#039;_weekdaysRegex&#039;)) {
                this._weekdaysRegex = defaultWeekdaysRegex;
            }
            return this._weekdaysStrictRegex &amp;&amp; isStrict
                ? this._weekdaysStrictRegex
                : this._weekdaysRegex;
        }
    }

    function weekdaysShortRegex(isStrict) {
        if (this._weekdaysParseExact) {
            if (!hasOwnProp(this, &#039;_weekdaysRegex&#039;)) {
                computeWeekdaysParse.call(this);
            }
            if (isStrict) {
                return this._weekdaysShortStrictRegex;
            } else {
                return this._weekdaysShortRegex;
            }
        } else {
            if (!hasOwnProp(this, &#039;_weekdaysShortRegex&#039;)) {
                this._weekdaysShortRegex = defaultWeekdaysShortRegex;
            }
            return this._weekdaysShortStrictRegex &amp;&amp; isStrict
                ? this._weekdaysShortStrictRegex
                : this._weekdaysShortRegex;
        }
    }

    function weekdaysMinRegex(isStrict) {
        if (this._weekdaysParseExact) {
            if (!hasOwnProp(this, &#039;_weekdaysRegex&#039;)) {
                computeWeekdaysParse.call(this);
            }
            if (isStrict) {
                return this._weekdaysMinStrictRegex;
            } else {
                return this._weekdaysMinRegex;
            }
        } else {
            if (!hasOwnProp(this, &#039;_weekdaysMinRegex&#039;)) {
                this._weekdaysMinRegex = defaultWeekdaysMinRegex;
            }
            return this._weekdaysMinStrictRegex &amp;&amp; isStrict
                ? this._weekdaysMinStrictRegex
                : this._weekdaysMinRegex;
        }
    }

    function computeWeekdaysParse() {
        function cmpLenRev(a, b) {
            return b.length - a.length;
        }

        var minPieces = [],
            shortPieces = [],
            longPieces = [],
            mixedPieces = [],
            i,
            mom,
            minp,
            shortp,
            longp;
        for (i = 0; i &lt; 7; i++) {
            // make the regex if we don&#039;t have it already
            mom = createUTC([2000, 1]).day(i);
            minp = regexEscape(this.weekdaysMin(mom, &#039;&#039;));
            shortp = regexEscape(this.weekdaysShort(mom, &#039;&#039;));
            longp = regexEscape(this.weekdays(mom, &#039;&#039;));
            minPieces.push(minp);
            shortPieces.push(shortp);
            longPieces.push(longp);
            mixedPieces.push(minp);
            mixedPieces.push(shortp);
            mixedPieces.push(longp);
        }
        // Sorting makes sure if one weekday (or abbr) is a prefix of another it
        // will match the longer piece.
        minPieces.sort(cmpLenRev);
        shortPieces.sort(cmpLenRev);
        longPieces.sort(cmpLenRev);
        mixedPieces.sort(cmpLenRev);

        this._weekdaysRegex = new RegExp(&#039;^(&#039; + mixedPieces.join(&#039;|&#039;) + &#039;)&#039;, &#039;i&#039;);
        this._weekdaysShortRegex = this._weekdaysRegex;
        this._weekdaysMinRegex = this._weekdaysRegex;

        this._weekdaysStrictRegex = new RegExp(
            &#039;^(&#039; + longPieces.join(&#039;|&#039;) + &#039;)&#039;,
            &#039;i&#039;
        );
        this._weekdaysShortStrictRegex = new RegExp(
            &#039;^(&#039; + shortPieces.join(&#039;|&#039;) + &#039;)&#039;,
            &#039;i&#039;
        );
        this._weekdaysMinStrictRegex = new RegExp(
            &#039;^(&#039; + minPieces.join(&#039;|&#039;) + &#039;)&#039;,
            &#039;i&#039;
        );
    }

    // FORMATTING

    function hFormat() {
        return this.hours() % 12 || 12;
    }

    function kFormat() {
        return this.hours() || 24;
    }

    addFormatToken(&#039;H&#039;, [&#039;HH&#039;, 2], 0, &#039;hour&#039;);
    addFormatToken(&#039;h&#039;, [&#039;hh&#039;, 2], 0, hFormat);
    addFormatToken(&#039;k&#039;, [&#039;kk&#039;, 2], 0, kFormat);

    addFormatToken(&#039;hmm&#039;, 0, 0, function () {
        return &#039;&#039; + hFormat.apply(this) + zeroFill(this.minutes(), 2);
    });

    addFormatToken(&#039;hmmss&#039;, 0, 0, function () {
        return (
            &#039;&#039; +
            hFormat.apply(this) +
            zeroFill(this.minutes(), 2) +
            zeroFill(this.seconds(), 2)
        );
    });

    addFormatToken(&#039;Hmm&#039;, 0, 0, function () {
        return &#039;&#039; + this.hours() + zeroFill(this.minutes(), 2);
    });

    addFormatToken(&#039;Hmmss&#039;, 0, 0, function () {
        return (
            &#039;&#039; +
            this.hours() +
            zeroFill(this.minutes(), 2) +
            zeroFill(this.seconds(), 2)
        );
    });

    function meridiem(token, lowercase) {
        addFormatToken(token, 0, 0, function () {
            return this.localeData().meridiem(
                this.hours(),
                this.minutes(),
                lowercase
            );
        });
    }

    meridiem(&#039;a&#039;, true);
    meridiem(&#039;A&#039;, false);

    // PARSING

    function matchMeridiem(isStrict, locale) {
        return locale._meridiemParse;
    }

    addRegexToken(&#039;a&#039;, matchMeridiem);
    addRegexToken(&#039;A&#039;, matchMeridiem);
    addRegexToken(&#039;H&#039;, match1to2, match1to2HasZero);
    addRegexToken(&#039;h&#039;, match1to2, match1to2NoLeadingZero);
    addRegexToken(&#039;k&#039;, match1to2, match1to2NoLeadingZero);
    addRegexToken(&#039;HH&#039;, match1to2, match2);
    addRegexToken(&#039;hh&#039;, match1to2, match2);
    addRegexToken(&#039;kk&#039;, match1to2, match2);

    addRegexToken(&#039;hmm&#039;, match3to4);
    addRegexToken(&#039;hmmss&#039;, match5to6);
    addRegexToken(&#039;Hmm&#039;, match3to4);
    addRegexToken(&#039;Hmmss&#039;, match5to6);

    addParseToken([&#039;H&#039;, &#039;HH&#039;], HOUR);
    addParseToken([&#039;k&#039;, &#039;kk&#039;], function (input, array, config) {
        var kInput = toInt(input);
        array[HOUR] = kInput === 24 ? 0 : kInput;
    });
    addParseToken([&#039;a&#039;, &#039;A&#039;], function (input, array, config) {
        config._isPm = config._locale.isPM(input);
        config._meridiem = input;
    });
    addParseToken([&#039;h&#039;, &#039;hh&#039;], function (input, array, config) {
        array[HOUR] = toInt(input);
        getParsingFlags(config).bigHour = true;
    });
    addParseToken(&#039;hmm&#039;, function (input, array, config) {
        var pos = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos));
        array[MINUTE] = toInt(input.substr(pos));
        getParsingFlags(config).bigHour = true;
    });
    addParseToken(&#039;hmmss&#039;, function (input, array, config) {
        var pos1 = input.length - 4,
            pos2 = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos1));
        array[MINUTE] = toInt(input.substr(pos1, 2));
        array[SECOND] = toInt(input.substr(pos2));
        getParsingFlags(config).bigHour = true;
    });
    addParseToken(&#039;Hmm&#039;, function (input, array, config) {
        var pos = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos));
        array[MINUTE] = toInt(input.substr(pos));
    });
    addParseToken(&#039;Hmmss&#039;, function (input, array, config) {
        var pos1 = input.length - 4,
            pos2 = input.length - 2;
        array[HOUR] = toInt(input.substr(0, pos1));
        array[MINUTE] = toInt(input.substr(pos1, 2));
        array[SECOND] = toInt(input.substr(pos2));
    });

    // LOCALES

    function localeIsPM(input) {
        // IE8 Quirks Mode &amp; IE7 Standards Mode do not allow accessing strings like arrays
        // Using charAt should be more compatible.
        return (input + &#039;&#039;).toLowerCase().charAt(0) === &#039;p&#039;;
    }

    var defaultLocaleMeridiemParse = /[ap]\.?m?\.?/i,
        // Setting the hour should keep the time, because the user explicitly
        // specified which hour they want. So trying to maintain the same hour (in
        // a new timezone) makes sense. Adding/subtracting hours does not follow
        // this rule.
        getSetHour = makeGetSet(&#039;Hours&#039;, true);

    function localeMeridiem(hours, minutes, isLower) {
        if (hours &gt; 11) {
            return isLower ? &#039;pm&#039; : &#039;PM&#039;;
        } else {
            return isLower ? &#039;am&#039; : &#039;AM&#039;;
        }
    }

    var baseConfig = {
        calendar: defaultCalendar,
        longDateFormat: defaultLongDateFormat,
        invalidDate: defaultInvalidDate,
        ordinal: defaultOrdinal,
        dayOfMonthOrdinalParse: defaultDayOfMonthOrdinalParse,
        relativeTime: defaultRelativeTime,

        months: defaultLocaleMonths,
        monthsShort: defaultLocaleMonthsShort,

        week: defaultLocaleWeek,

        weekdays: defaultLocaleWeekdays,
        weekdaysMin: defaultLocaleWeekdaysMin,
        weekdaysShort: defaultLocaleWeekdaysShort,

        meridiemParse: defaultLocaleMeridiemParse,
    };

    // internal storage for locale config files
    var locales = {},
        localeFamilies = {},
        globalLocale;

    function commonPrefix(arr1, arr2) {
        var i,
            minl = Math.min(arr1.length, arr2.length);
        for (i = 0; i &lt; minl; i += 1) {
            if (arr1[i] !== arr2[i]) {
                return i;
            }
        }
        return minl;
    }

    function normalizeLocale(key) {
        return key ? key.toLowerCase().replace(&#039;_&#039;, &#039;-&#039;) : key;
    }

    // pick the locale from the array
    // try [&#039;en-au&#039;, &#039;en-gb&#039;] as &#039;en-au&#039;, &#039;en-gb&#039;, &#039;en&#039;, as in move through the list trying each
    // substring from most specific to least, but move to the next array item if it&#039;s a more specific variant than the current root
    function chooseLocale(names) {
        var i = 0,
            j,
            next,
            locale,
            split;

        while (i &lt; names.length) {
            split = normalizeLocale(names[i]).split(&#039;-&#039;);
            j = split.length;
            next = normalizeLocale(names[i + 1]);
            next = next ? next.split(&#039;-&#039;) : null;
            while (j &gt; 0) {
                locale = loadLocale(split.slice(0, j).join(&#039;-&#039;));
                if (locale) {
                    return locale;
                }
                if (
                    next &amp;&amp;
                    next.length &gt;= j &amp;&amp;
                    commonPrefix(split, next) &gt;= j - 1
                ) {
                    //the next array item is better than a shallower substring of this one
                    break;
                }
                j--;
            }
            i++;
        }
        return globalLocale;
    }

    function isLocaleNameSane(name) {
        // Prevent names that look like filesystem paths, i.e contain &#039;/&#039; or &#039;\&#039;
        // Ensure name is available and function returns boolean
        return !!(name &amp;&amp; name.match(&#039;^[^/\\\\]*$&#039;));
    }

    function loadLocale(name) {
        var oldLocale = null,
            aliasedRequire;
        // TODO: Find a better way to register and load all the locales in Node
        if (
            locales[name] === undefined &amp;&amp;
            typeof module !== &#039;undefined&#039; &amp;&amp;
            module &amp;&amp;
            module.exports &amp;&amp;
            isLocaleNameSane(name)
        ) {
            try {
                oldLocale = globalLocale._abbr;
                aliasedRequire = require;
                aliasedRequire(&#039;./locale/&#039; + name);
                getSetGlobalLocale(oldLocale);
            } catch (e) {
                // mark as not found to avoid repeating expensive file require call causing high CPU
                // when trying to find en-US, en_US, en-us for every format call
                locales[name] = null; // null means not found
            }
        }
        return locales[name];
    }

    // This function will load locale and then set the global locale.  If
    // no arguments are passed in, it will simply return the current global
    // locale key.
    function getSetGlobalLocale(key, values) {
        var data;
        if (key) {
            if (isUndefined(values)) {
                data = getLocale(key);
            } else {
                data = defineLocale(key, values);
            }

            if (data) {
                // moment.duration._locale = moment._locale = data;
                globalLocale = data;
            } else {
                if (typeof console !== &#039;undefined&#039; &amp;&amp; console.warn) {
                    //warn user if arguments are passed but the locale could not be set
                    console.warn(
                        &#039;Locale &#039; + key + &#039; not found. Did you forget to load it?&#039;
                    );
                }
            }
        }

        return globalLocale._abbr;
    }

    function defineLocale(name, config) {
        if (config !== null) {
            var locale,
                parentConfig = baseConfig;
            config.abbr = name;
            if (locales[name] != null) {
                deprecateSimple(
                    &#039;defineLocaleOverride&#039;,
                    &#039;use moment.updateLocale(localeName, config) to change &#039; +
                        &#039;an existing locale. moment.defineLocale(localeName, &#039; +
                        &#039;config) should only be used for creating a new locale &#039; +
                        &#039;See http://momentjs.com/guides/#/warnings/define-locale/ for more info.&#039;
                );
                parentConfig = locales[name]._config;
            } else if (config.parentLocale != null) {
                if (locales[config.parentLocale] != null) {
                    parentConfig = locales[config.parentLocale]._config;
                } else {
                    locale = loadLocale(config.parentLocale);
                    if (locale != null) {
                        parentConfig = locale._config;
                    } else {
                        if (!localeFamilies[config.parentLocale]) {
                            localeFamilies[config.parentLocale] = [];
                        }
                        localeFamilies[config.parentLocale].push({
                            name: name,
                            config: config,
                        });
                        return null;
                    }
                }
            }
            locales[name] = new Locale(mergeConfigs(parentConfig, config));

            if (localeFamilies[name]) {
                localeFamilies[name].forEach(function (x) {
                    defineLocale(x.name, x.config);
                });
            }

            // backwards compat for now: also set the locale
            // make sure we set the locale AFTER all child locales have been
            // created, so we won&#039;t end up with the child locale set.
            getSetGlobalLocale(name);

            return locales[name];
        } else {
            // useful for testing
            delete locales[name];
            return null;
        }
    }

    function updateLocale(name, config) {
        if (config != null) {
            var locale,
                tmpLocale,
                parentConfig = baseConfig;

            if (locales[name] != null &amp;&amp; locales[name].parentLocale != null) {
                // Update existing child locale in-place to avoid memory-leaks
                locales[name].set(mergeConfigs(locales[name]._config, config));
            } else {
                // MERGE
                tmpLocale = loadLocale(name);
                if (tmpLocale != null) {
                    parentConfig = tmpLocale._config;
                }
                config = mergeConfigs(parentConfig, config);
                if (tmpLocale == null) {
                    // updateLocale is called for creating a new locale
                    // Set abbr so it will have a name (getters return
                    // undefined otherwise).
                    config.abbr = name;
                }
                locale = new Locale(config);
                locale.parentLocale = locales[name];
                locales[name] = locale;
            }

            // backwards compat for now: also set the locale
            getSetGlobalLocale(name);
        } else {
            // pass null for config to unupdate, useful for tests
            if (locales[name] != null) {
                if (locales[name].parentLocale != null) {
                    locales[name] = locales[name].parentLocale;
                    if (name === getSetGlobalLocale()) {
                        getSetGlobalLocale(name);
                    }
                } else if (locales[name] != null) {
                    delete locales[name];
                }
            }
        }
        return locales[name];
    }

    // returns locale data
    function getLocale(key) {
        var locale;

        if (key &amp;&amp; key._locale &amp;&amp; key._locale._abbr) {
            key = key._locale._abbr;
        }

        if (!key) {
            return globalLocale;
        }

        if (!isArray(key)) {
            //short-circuit everything else
            locale = loadLocale(key);
            if (locale) {
                return locale;
            }
            key = [key];
        }

        return chooseLocale(key);
    }

    function listLocales() {
        return keys(locales);
    }

    function checkOverflow(m) {
        var overflow,
            a = m._a;

        if (a &amp;&amp; getParsingFlags(m).overflow === -2) {
            overflow =
                a[MONTH] &lt; 0 || a[MONTH] &gt; 11
                    ? MONTH
                    : a[DATE] &lt; 1 || a[DATE] &gt; daysInMonth(a[YEAR], a[MONTH])
                      ? DATE
                      : a[HOUR] &lt; 0 ||
                          a[HOUR] &gt; 24 ||
                          (a[HOUR] === 24 &amp;&amp;
                              (a[MINUTE] !== 0 ||
                                  a[SECOND] !== 0 ||
                                  a[MILLISECOND] !== 0))
                        ? HOUR
                        : a[MINUTE] &lt; 0 || a[MINUTE] &gt; 59
                          ? MINUTE
                          : a[SECOND] &lt; 0 || a[SECOND] &gt; 59
                            ? SECOND
                            : a[MILLISECOND] &lt; 0 || a[MILLISECOND] &gt; 999
                              ? MILLISECOND
                              : -1;

            if (
                getParsingFlags(m)._overflowDayOfYear &amp;&amp;
                (overflow &lt; YEAR || overflow &gt; DATE)
            ) {
                overflow = DATE;
            }
            if (getParsingFlags(m)._overflowWeeks &amp;&amp; overflow === -1) {
                overflow = WEEK;
            }
            if (getParsingFlags(m)._overflowWeekday &amp;&amp; overflow === -1) {
                overflow = WEEKDAY;
            }

            getParsingFlags(m).overflow = overflow;
        }

        return m;
    }

    // iso 8601 regex
    // 0000-00-00 0000-W00 or 0000-W00-0 + T + 00 or 00:00 or 00:00:00 or 00:00:00.000 + +00:00 or +0000 or +00)
    var extendedIsoRegex =
            /^\s*((?:[+-]\d{6}|\d{4})-(?:\d\d-\d\d|W\d\d-\d|W\d\d|\d\d\d|\d\d))(?:(T| )(\d\d(?::\d\d(?::\d\d(?:[.,]\d+)?)?)?)([+-]\d\d(?::?\d\d)?|\s*Z)?)?$/,
        basicIsoRegex =
            /^\s*((?:[+-]\d{6}|\d{4})(?:\d\d\d\d|W\d\d\d|W\d\d|\d\d\d|\d\d|))(?:(T| )(\d\d(?:\d\d(?:\d\d(?:[.,]\d+)?)?)?)([+-]\d\d(?::?\d\d)?|\s*Z)?)?$/,
        tzRegex = /Z|[+-]\d\d(?::?\d\d)?/,
        isoDates = [
            [&#039;YYYYYY-MM-DD&#039;, /[+-]\d{6}-\d\d-\d\d/],
            [&#039;YYYY-MM-DD&#039;, /\d{4}-\d\d-\d\d/],
            [&#039;GGGG-[W]WW-E&#039;, /\d{4}-W\d\d-\d/],
            [&#039;GGGG-[W]WW&#039;, /\d{4}-W\d\d/, false],
            [&#039;YYYY-DDD&#039;, /\d{4}-\d{3}/],
            [&#039;YYYY-MM&#039;, /\d{4}-\d\d/, false],
            [&#039;YYYYYYMMDD&#039;, /[+-]\d{10}/],
            [&#039;YYYYMMDD&#039;, /\d{8}/],
            [&#039;GGGG[W]WWE&#039;, /\d{4}W\d{3}/],
            [&#039;GGGG[W]WW&#039;, /\d{4}W\d{2}/, false],
            [&#039;YYYYDDD&#039;, /\d{7}/],
            [&#039;YYYYMM&#039;, /\d{6}/, false],
            [&#039;YYYY&#039;, /\d{4}/, false],
        ],
        // iso time formats and regexes
        isoTimes = [
            [&#039;HH:mm:ss.SSSS&#039;, /\d\d:\d\d:\d\d\.\d+/],
            [&#039;HH:mm:ss,SSSS&#039;, /\d\d:\d\d:\d\d,\d+/],
            [&#039;HH:mm:ss&#039;, /\d\d:\d\d:\d\d/],
            [&#039;HH:mm&#039;, /\d\d:\d\d/],
            [&#039;HHmmss.SSSS&#039;, /\d\d\d\d\d\d\.\d+/],
            [&#039;HHmmss,SSSS&#039;, /\d\d\d\d\d\d,\d+/],
            [&#039;HHmmss&#039;, /\d\d\d\d\d\d/],
            [&#039;HHmm&#039;, /\d\d\d\d/],
            [&#039;HH&#039;, /\d\d/],
        ],
        aspNetJsonRegex = /^\/?Date\((-?\d+)/i,
        // RFC 2822 regex: For details see https://tools.ietf.org/html/rfc2822#section-3.3
        rfc2822 =
            /^(?:(Mon|Tue|Wed|Thu|Fri|Sat|Sun),?\s)?(\d{1,2})\s(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s(\d{2,4})\s(\d\d):(\d\d)(?::(\d\d))?\s(?:(UT|GMT|[ECMP][SD]T)|([Zz])|([+-]\d{4}))$/,
        obsOffsets = {
            UT: 0,
            GMT: 0,
            EDT: -4 * 60,
            EST: -5 * 60,
            CDT: -5 * 60,
            CST: -6 * 60,
            MDT: -6 * 60,
            MST: -7 * 60,
            PDT: -7 * 60,
            PST: -8 * 60,
        };

    // date from iso format
    function configFromISO(config) {
        var i,
            l,
            string = config._i,
            match = extendedIsoRegex.exec(string) || basicIsoRegex.exec(string),
            allowTime,
            dateFormat,
            timeFormat,
            tzFormat,
            isoDatesLen = isoDates.length,
            isoTimesLen = isoTimes.length;

        if (match) {
            getParsingFlags(config).iso = true;
            for (i = 0, l = isoDatesLen; i &lt; l; i++) {
                if (isoDates[i][1].exec(match[1])) {
                    dateFormat = isoDates[i][0];
                    allowTime = isoDates[i][2] !== false;
                    break;
                }
            }
            if (dateFormat == null) {
                config._isValid = false;
                return;
            }
            if (match[3]) {
                for (i = 0, l = isoTimesLen; i &lt; l; i++) {
                    if (isoTimes[i][1].exec(match[3])) {
                        // match[2] should be &#039;T&#039; or space
                        timeFormat = (match[2] || &#039; &#039;) + isoTimes[i][0];
                        break;
                    }
                }
                if (timeFormat == null) {
                    config._isValid = false;
                    return;
                }
            }
            if (!allowTime &amp;&amp; timeFormat != null) {
                config._isValid = false;
                return;
            }
            if (match[4]) {
                if (tzRegex.exec(match[4])) {
                    tzFormat = &#039;Z&#039;;
                } else {
                    config._isValid = false;
                    return;
                }
            }
            config._f = dateFormat + (timeFormat || &#039;&#039;) + (tzFormat || &#039;&#039;);
            configFromStringAndFormat(config);
        } else {
            config._isValid = false;
        }
    }

    function extractFromRFC2822Strings(
        yearStr,
        monthStr,
        dayStr,
        hourStr,
        minuteStr,
        secondStr
    ) {
        var result = [
            untruncateYear(yearStr),
            defaultLocaleMonthsShort.indexOf(monthStr),
            parseInt(dayStr, 10),
            parseInt(hourStr, 10),
            parseInt(minuteStr, 10),
        ];

        if (secondStr) {
            result.push(parseInt(secondStr, 10));
        }

        return result;
    }

    function untruncateYear(yearStr) {
        var year = parseInt(yearStr, 10);
        if (year &lt;= 49) {
            return 2000 + year;
        } else if (year &lt;= 999) {
            return 1900 + year;
        }
        return year;
    }

    function preprocessRFC2822(s) {
        // Remove comments and folding whitespace and replace multiple-spaces with a single space
        return s
            .replace(/\([^()]*\)|[\n\t]/g, &#039; &#039;)
            .replace(/(\s\s+)/g, &#039; &#039;)
            .replace(/^\s\s*/, &#039;&#039;)
            .replace(/\s\s*$/, &#039;&#039;);
    }

    function checkWeekday(weekdayStr, parsedInput, config) {
        if (weekdayStr) {
            // TODO: Replace the vanilla JS Date object with an independent day-of-week check.
            var weekdayProvided = defaultLocaleWeekdaysShort.indexOf(weekdayStr),
                weekdayActual = new Date(
                    parsedInput[0],
                    parsedInput[1],
                    parsedInput[2]
                ).getDay();
            if (weekdayProvided !== weekdayActual) {
                getParsingFlags(config).weekdayMismatch = true;
                config._isValid = false;
                return false;
            }
        }
        return true;
    }

    function calculateOffset(obsOffset, militaryOffset, numOffset) {
        if (obsOffset) {
            return obsOffsets[obsOffset];
        } else if (militaryOffset) {
            // the only allowed military tz is Z
            return 0;
        } else {
            var hm = parseInt(numOffset, 10),
                m = hm % 100,
                h = (hm - m) / 100;
            return h * 60 + m;
        }
    }

    // date and time from ref 2822 format
    function configFromRFC2822(config) {
        var match = rfc2822.exec(preprocessRFC2822(config._i)),
            parsedArray;
        if (match) {
            parsedArray = extractFromRFC2822Strings(
                match[4],
                match[3],
                match[2],
                match[5],
                match[6],
                match[7]
            );
            if (!checkWeekday(match[1], parsedArray, config)) {
                return;
            }

            config._a = parsedArray;
            config._tzm = calculateOffset(match[8], match[9], match[10]);

            config._d = createUTCDate.apply(null, config._a);
            config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);

            getParsingFlags(config).rfc2822 = true;
        } else {
            config._isValid = false;
        }
    }

    // date from 1) ASP.NET, 2) ISO, 3) RFC 2822 formats, or 4) optional fallback if parsing isn&#039;t strict
    function configFromString(config) {
        var matched = aspNetJsonRegex.exec(config._i);
        if (matched !== null) {
            config._d = new Date(+matched[1]);
            return;
        }

        configFromISO(config);
        if (config._isValid === false) {
            delete config._isValid;
        } else {
            return;
        }

        configFromRFC2822(config);
        if (config._isValid === false) {
            delete config._isValid;
        } else {
            return;
        }

        if (config._strict) {
            config._isValid = false;
        } else {
            // Final attempt, use Input Fallback
            hooks.createFromInputFallback(config);
        }
    }

    hooks.createFromInputFallback = deprecate(
        &#039;value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), &#039; +
            &#039;which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are &#039; +
            &#039;discouraged. Please refer to http://momentjs.com/guides/#/warnings/js-date/ for more info.&#039;,
        function (config) {
            config._d = new Date(config._i + (config._useUTC ? &#039; UTC&#039; : &#039;&#039;));
        }
    );

    // Pick the first defined of two or three arguments.
    function defaults(a, b, c) {
        if (a != null) {
            return a;
        }
        if (b != null) {
            return b;
        }
        return c;
    }

    function currentDateArray(config) {
        // hooks is actually the exported moment object
        var nowValue = new Date(hooks.now());
        if (config._useUTC) {
            return [
                nowValue.getUTCFullYear(),
                nowValue.getUTCMonth(),
                nowValue.getUTCDate(),
            ];
        }
        return [nowValue.getFullYear(), nowValue.getMonth(), nowValue.getDate()];
    }

    // convert an array to a date.
    // the array should mirror the parameters below
    // note: all values past the year are optional and will default to the lowest possible value.
    // [year, month, day , hour, minute, second, millisecond]
    function configFromArray(config) {
        var i,
            date,
            input = [],
            currentDate,
            expectedWeekday,
            yearToUse;

        if (config._d) {
            return;
        }

        currentDate = currentDateArray(config);

        //compute day of the year from weeks and weekdays
        if (config._w &amp;&amp; config._a[DATE] == null &amp;&amp; config._a[MONTH] == null) {
            dayOfYearFromWeekInfo(config);
        }

        //if the day of the year is set, figure out what it is
        if (config._dayOfYear != null) {
            yearToUse = defaults(config._a[YEAR], currentDate[YEAR]);

            if (
                config._dayOfYear &gt; daysInYear(yearToUse) ||
                config._dayOfYear === 0
            ) {
                getParsingFlags(config)._overflowDayOfYear = true;
            }

            date = createUTCDate(yearToUse, 0, config._dayOfYear);
            config._a[MONTH] = date.getUTCMonth();
            config._a[DATE] = date.getUTCDate();
        }

        // Default to current date.
        // * if no year, month, day of month are given, default to today
        // * if day of month is given, default month and year
        // * if month is given, default only year
        // * if year is given, don&#039;t default anything
        for (i = 0; i &lt; 3 &amp;&amp; config._a[i] == null; ++i) {
            config._a[i] = input[i] = currentDate[i];
        }

        // Zero out whatever was not defaulted, including time
        for (; i &lt; 7; i++) {
            config._a[i] = input[i] =
                config._a[i] == null ? (i === 2 ? 1 : 0) : config._a[i];
        }

        // Check for 24:00:00.000
        if (
            config._a[HOUR] === 24 &amp;&amp;
            config._a[MINUTE] === 0 &amp;&amp;
            config._a[SECOND] === 0 &amp;&amp;
            config._a[MILLISECOND] === 0
        ) {
            config._nextDay = true;
            config._a[HOUR] = 0;
        }

        config._d = (config._useUTC ? createUTCDate : createDate).apply(
            null,
            input
        );
        expectedWeekday = config._useUTC
            ? config._d.getUTCDay()
            : config._d.getDay();

        // Apply timezone offset from input. The actual utcOffset can be changed
        // with parseZone.
        if (config._tzm != null) {
            config._d.setUTCMinutes(config._d.getUTCMinutes() - config._tzm);
        }

        if (config._nextDay) {
            config._a[HOUR] = 24;
        }

        // check for mismatching day of week
        if (
            config._w &amp;&amp;
            typeof config._w.d !== &#039;undefined&#039; &amp;&amp;
            config._w.d !== expectedWeekday
        ) {
            getParsingFlags(config).weekdayMismatch = true;
        }
    }

    function dayOfYearFromWeekInfo(config) {
        var w, weekYear, week, weekday, dow, doy, temp, weekdayOverflow, curWeek;

        w = config._w;
        if (w.GG != null || w.W != null || w.E != null) {
            dow = 1;
            doy = 4;

            // TODO: We need to take the current isoWeekYear, but that depends on
            // how we interpret now (local, utc, fixed offset). So create
            // a now version of current config (take local/utc/offset flags, and
            // create now).
            weekYear = defaults(
                w.GG,
                config._a[YEAR],
                weekOfYear(createLocal(), 1, 4).year
            );
            week = defaults(w.W, 1);
            weekday = defaults(w.E, 1);
            if (weekday &lt; 1 || weekday &gt; 7) {
                weekdayOverflow = true;
            }
        } else {
            dow = config._locale._week.dow;
            doy = config._locale._week.doy;

            curWeek = weekOfYear(createLocal(), dow, doy);

            weekYear = defaults(w.gg, config._a[YEAR], curWeek.year);

            // Default to current week.
            week = defaults(w.w, curWeek.week);

            if (w.d != null) {
                // weekday -- low day numbers are considered next week
                weekday = w.d;
                if (weekday &lt; 0 || weekday &gt; 6) {
                    weekdayOverflow = true;
                }
            } else if (w.e != null) {
                // local weekday -- counting starts from beginning of week
                weekday = w.e + dow;
                if (w.e &lt; 0 || w.e &gt; 6) {
                    weekdayOverflow = true;
                }
            } else {
                // default to beginning of week
                weekday = dow;
            }
        }
        if (week &lt; 1 || week &gt; weeksInYear(weekYear, dow, doy)) {
            getParsingFlags(config)._overflowWeeks = true;
        } else if (weekdayOverflow != null) {
            getParsingFlags(config)._overflowWeekday = true;
        } else {
            temp = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy);
            config._a[YEAR] = temp.year;
            config._dayOfYear = temp.dayOfYear;
        }
    }

    // constant that refers to the ISO standard
    hooks.ISO_8601 = function () {};

    // constant that refers to the RFC 2822 form
    hooks.RFC_2822 = function () {};

    // date from string and format string
    function configFromStringAndFormat(config) {
        // TODO: Move this to another part of the creation flow to prevent circular deps
        if (config._f === hooks.ISO_8601) {
            configFromISO(config);
            return;
        }
        if (config._f === hooks.RFC_2822) {
            configFromRFC2822(config);
            return;
        }
        config._a = [];
        getParsingFlags(config).empty = true;

        // This array is used to make a Date, either with `new Date` or `Date.UTC`
        var string = &#039;&#039; + config._i,
            i,
            parsedInput,
            tokens,
            token,
            skipped,
            stringLength = string.length,
            totalParsedInputLength = 0,
            era,
            tokenLen;

        tokens =
            expandFormat(config._f, config._locale).match(formattingTokens) || [];
        tokenLen = tokens.length;
        for (i = 0; i &lt; tokenLen; i++) {
            token = tokens[i];
            parsedInput = (string.match(getParseRegexForToken(token, config)) ||
                [])[0];
            if (parsedInput) {
                skipped = string.substr(0, string.indexOf(parsedInput));
                if (skipped.length &gt; 0) {
                    getParsingFlags(config).unusedInput.push(skipped);
                }
                string = string.slice(
                    string.indexOf(parsedInput) + parsedInput.length
                );
                totalParsedInputLength += parsedInput.length;
            }
            // don&#039;t parse if it&#039;s not a known token
            if (formatTokenFunctions[token]) {
                if (parsedInput) {
                    getParsingFlags(config).empty = false;
                } else {
                    getParsingFlags(config).unusedTokens.push(token);
                }
                addTimeToArrayFromToken(token, parsedInput, config);
            } else if (config._strict &amp;&amp; !parsedInput) {
                getParsingFlags(config).unusedTokens.push(token);
            }
        }

        // add remaining unparsed input length to the string
        getParsingFlags(config).charsLeftOver =
            stringLength - totalParsedInputLength;
        if (string.length &gt; 0) {
            getParsingFlags(config).unusedInput.push(string);
        }

        // clear _12h flag if hour is &lt;= 12
        if (
            config._a[HOUR] &lt;= 12 &amp;&amp;
            getParsingFlags(config).bigHour === true &amp;&amp;
            config._a[HOUR] &gt; 0
        ) {
            getParsingFlags(config).bigHour = undefined;
        }

        getParsingFlags(config).parsedDateParts = config._a.slice(0);
        getParsingFlags(config).meridiem = config._meridiem;
        // handle meridiem
        config._a[HOUR] = meridiemFixWrap(
            config._locale,
            config._a[HOUR],
            config._meridiem
        );

        // handle era
        era = getParsingFlags(config).era;
        if (era !== null) {
            config._a[YEAR] = config._locale.erasConvertYear(era, config._a[YEAR]);
        }

        configFromArray(config);
        checkOverflow(config);
    }

    function meridiemFixWrap(locale, hour, meridiem) {
        var isPm;

        if (meridiem == null) {
            // nothing to do
            return hour;
        }
        if (locale.meridiemHour != null) {
            return locale.meridiemHour(hour, meridiem);
        } else if (locale.isPM != null) {
            // Fallback
            isPm = locale.isPM(meridiem);
            if (isPm &amp;&amp; hour &lt; 12) {
                hour += 12;
            }
            if (!isPm &amp;&amp; hour === 12) {
                hour = 0;
            }
            return hour;
        } else {
            // this is not supposed to happen
            return hour;
        }
    }

    // date from string and array of format strings
    function configFromStringAndArray(config) {
        var tempConfig,
            bestMoment,
            scoreToBeat,
            i,
            currentScore,
            validFormatFound,
            bestFormatIsValid = false,
            configfLen = config._f.length;

        if (configfLen === 0) {
            getParsingFlags(config).invalidFormat = true;
            config._d = new Date(NaN);
            return;
        }

        for (i = 0; i &lt; configfLen; i++) {
            currentScore = 0;
            validFormatFound = false;
            tempConfig = copyConfig({}, config);
            if (config._useUTC != null) {
                tempConfig._useUTC = config._useUTC;
            }
            tempConfig._f = config._f[i];
            configFromStringAndFormat(tempConfig);

            if (isValid(tempConfig)) {
                validFormatFound = true;
            }

            // if there is any input that was not parsed add a penalty for that format
            currentScore += getParsingFlags(tempConfig).charsLeftOver;

            //or tokens
            currentScore += getParsingFlags(tempConfig).unusedTokens.length * 10;

            getParsingFlags(tempConfig).score = currentScore;

            if (!bestFormatIsValid) {
                if (
                    scoreToBeat == null ||
                    currentScore &lt; scoreToBeat ||
                    validFormatFound
                ) {
                    scoreToBeat = currentScore;
                    bestMoment = tempConfig;
                    if (validFormatFound) {
                        bestFormatIsValid = true;
                    }
                }
            } else {
                if (currentScore &lt; scoreToBeat) {
                    scoreToBeat = currentScore;
                    bestMoment = tempConfig;
                }
            }
        }

        extend(config, bestMoment || tempConfig);
    }

    function configFromObject(config) {
        if (config._d) {
            return;
        }

        var i = normalizeObjectUnits(config._i),
            dayOrDate = i.day === undefined ? i.date : i.day;
        config._a = map(
            [i.year, i.month, dayOrDate, i.hour, i.minute, i.second, i.millisecond],
            function (obj) {
                return obj &amp;&amp; parseInt(obj, 10);
            }
        );

        configFromArray(config);
    }

    function createFromConfig(config) {
        var res = new Moment(checkOverflow(prepareConfig(config)));
        if (res._nextDay) {
            // Adding is smart enough around DST
            res.add(1, &#039;d&#039;);
            res._nextDay = undefined;
        }

        return res;
    }

    function prepareConfig(config) {
        var input = config._i,
            format = config._f;

        config._locale = config._locale || getLocale(config._l);

        if (input === null || (format === undefined &amp;&amp; input === &#039;&#039;)) {
            return createInvalid({ nullInput: true });
        }

        if (typeof input === &#039;string&#039;) {
            config._i = input = config._locale.preparse(input);
        }

        if (isMoment(input)) {
            return new Moment(checkOverflow(input));
        } else if (isDate(input)) {
            config._d = input;
        } else if (isArray(format)) {
            configFromStringAndArray(config);
        } else if (format) {
            configFromStringAndFormat(config);
        } else {
            configFromInput(config);
        }

        if (!isValid(config)) {
            config._d = null;
        }

        return config;
    }

    function configFromInput(config) {
        var input = config._i;
        if (isUndefined(input)) {
            config._d = new Date(hooks.now());
        } else if (isDate(input)) {
            config._d = new Date(input.valueOf());
        } else if (typeof input === &#039;string&#039;) {
            configFromString(config);
        } else if (isArray(input)) {
            config._a = map(input.slice(0), function (obj) {
                return parseInt(obj, 10);
            });
            configFromArray(config);
        } else if (isObject(input)) {
            configFromObject(config);
        } else if (isNumber(input)) {
            // from milliseconds
            config._d = new Date(input);
        } else {
            hooks.createFromInputFallback(config);
        }
    }

    function createLocalOrUTC(input, format, locale, strict, isUTC) {
        var c = {};

        if (format === true || format === false) {
            strict = format;
            format = undefined;
        }

        if (locale === true || locale === false) {
            strict = locale;
            locale = undefined;
        }

        if (
            (isObject(input) &amp;&amp; isObjectEmpty(input)) ||
            (isArray(input) &amp;&amp; input.length === 0)
        ) {
            input = undefined;
        }
        // object construction must be done this way.
        // https://github.com/moment/moment/issues/1423
        c._isAMomentObject = true;
        c._useUTC = c._isUTC = isUTC;
        c._l = locale;
        c._i = input;
        c._f = format;
        c._strict = strict;

        return createFromConfig(c);
    }

    function createLocal(input, format, locale, strict) {
        return createLocalOrUTC(input, format, locale, strict, false);
    }

    var prototypeMin = deprecate(
            &#039;moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/&#039;,
            function () {
                var other = createLocal.apply(null, arguments);
                if (this.isValid() &amp;&amp; other.isValid()) {
                    return other &lt; this ? this : other;
                } else {
                    return createInvalid();
                }
            }
        ),
        prototypeMax = deprecate(
            &#039;moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/&#039;,
            function () {
                var other = createLocal.apply(null, arguments);
                if (this.isValid() &amp;&amp; other.isValid()) {
                    return other &gt; this ? this : other;
                } else {
                    return createInvalid();
                }
            }
        );

    // Pick a moment m from moments so that m[fn](other) is true for all
    // other. This relies on the function fn to be transitive.
    //
    // moments should either be an array of moment objects or an array, whose
    // first element is an array of moment objects.
    function pickBy(fn, moments) {
        var res, i;
        if (moments.length === 1 &amp;&amp; isArray(moments[0])) {
            moments = moments[0];
        }
        if (!moments.length) {
            return createLocal();
        }
        res = moments[0];
        for (i = 1; i &lt; moments.length; ++i) {
            if (!moments[i].isValid() || moments[i][fn](res)) {
                res = moments[i];
            }
        }
        return res;
    }

    // TODO: Use [].sort instead?
    function min() {
        var args = [].slice.call(arguments, 0);

        return pickBy(&#039;isBefore&#039;, args);
    }

    function max() {
        var args = [].slice.call(arguments, 0);

        return pickBy(&#039;isAfter&#039;, args);
    }

    var now = function () {
        return Date.now ? Date.now() : +new Date();
    };

    var ordering = [
        &#039;year&#039;,
        &#039;quarter&#039;,
        &#039;month&#039;,
        &#039;week&#039;,
        &#039;day&#039;,
        &#039;hour&#039;,
        &#039;minute&#039;,
        &#039;second&#039;,
        &#039;millisecond&#039;,
    ];

    function isDurationValid(m) {
        var key,
            unitHasDecimal = false,
            i,
            orderLen = ordering.length;
        for (key in m) {
            if (
                hasOwnProp(m, key) &amp;&amp;
                !(
                    indexOf.call(ordering, key) !== -1 &amp;&amp;
                    (m[key] == null || !isNaN(m[key]))
                )
            ) {
                return false;
            }
        }

        for (i = 0; i &lt; orderLen; ++i) {
            if (m[ordering[i]]) {
                if (unitHasDecimal) {
                    return false; // only allow non-integers for smallest unit
                }
                if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
                    unitHasDecimal = true;
                }
            }
        }

        return true;
    }

    function isValid$1() {
        return this._isValid;
    }

    function createInvalid$1() {
        return createDuration(NaN);
    }

    function Duration(duration) {
        var normalizedInput = normalizeObjectUnits(duration),
            years = normalizedInput.year || 0,
            quarters = normalizedInput.quarter || 0,
            months = normalizedInput.month || 0,
            weeks = normalizedInput.week || normalizedInput.isoWeek || 0,
            days = normalizedInput.day || 0,
            hours = normalizedInput.hour || 0,
            minutes = normalizedInput.minute || 0,
            seconds = normalizedInput.second || 0,
            milliseconds = normalizedInput.millisecond || 0;

        this._isValid = isDurationValid(normalizedInput);

        // representation for dateAddRemove
        this._milliseconds =
            +milliseconds +
            seconds * 1e3 + // 1000
            minutes * 6e4 + // 1000 * 60
            hours * 1000 * 60 * 60; //using 1000 * 60 * 60 instead of 36e5 to avoid floating point rounding errors https://github.com/moment/moment/issues/2978
        // Because of dateAddRemove treats 24 hours as different from a
        // day when working around DST, we need to store them separately
        this._days = +days + weeks * 7;
        // It is impossible to translate months into days without knowing
        // which months you are are talking about, so we have to store
        // it separately.
        this._months = +months + quarters * 3 + years * 12;

        this._data = {};

        this._locale = getLocale();

        this._bubble();
    }

    function isDuration(obj) {
        return obj instanceof Duration;
    }

    function absRound(number) {
        if (number &lt; 0) {
            return Math.round(-1 * number) * -1;
        } else {
            return Math.round(number);
        }
    }

    // compare two arrays, return the number of differences
    function compareArrays(array1, array2, dontConvert) {
        var len = Math.min(array1.length, array2.length),
            lengthDiff = Math.abs(array1.length - array2.length),
            diffs = 0,
            i;
        for (i = 0; i &lt; len; i++) {
            if (
                (dontConvert &amp;&amp; array1[i] !== array2[i]) ||
                (!dontConvert &amp;&amp; toInt(array1[i]) !== toInt(array2[i]))
            ) {
                diffs++;
            }
        }
        return diffs + lengthDiff;
    }

    // FORMATTING

    function offset(token, separator) {
        addFormatToken(token, 0, 0, function () {
            var offset = this.utcOffset(),
                sign = &#039;+&#039;;
            if (offset &lt; 0) {
                offset = -offset;
                sign = &#039;-&#039;;
            }
            return (
                sign +
                zeroFill(~~(offset / 60), 2) +
                separator +
                zeroFill(~~offset % 60, 2)
            );
        });
    }

    offset(&#039;Z&#039;, &#039;:&#039;);
    offset(&#039;ZZ&#039;, &#039;&#039;);

    // PARSING

    addRegexToken(&#039;Z&#039;, matchShortOffset);
    addRegexToken(&#039;ZZ&#039;, matchShortOffset);
    addParseToken([&#039;Z&#039;, &#039;ZZ&#039;], function (input, array, config) {
        config._useUTC = true;
        config._tzm = offsetFromString(matchShortOffset, input);
    });

    // HELPERS

    // timezone chunker
    // &#039;+10:00&#039; &gt; [&#039;10&#039;,  &#039;00&#039;]
    // &#039;-1530&#039;  &gt; [&#039;-15&#039;, &#039;30&#039;]
    var chunkOffset = /([\+\-]|\d\d)/gi;

    function offsetFromString(matcher, string) {
        var matches = (string || &#039;&#039;).match(matcher),
            chunk,
            parts,
            minutes;

        if (matches === null) {
            return null;
        }

        chunk = matches[matches.length - 1] || [];
        parts = (chunk + &#039;&#039;).match(chunkOffset) || [&#039;-&#039;, 0, 0];
        minutes = +(parts[1] * 60) + toInt(parts[2]);

        return minutes === 0 ? 0 : parts[0] === &#039;+&#039; ? minutes : -minutes;
    }

    // Return a moment from input, that is local/utc/zone equivalent to model.
    function cloneWithOffset(input, model) {
        var res, diff;
        if (model._isUTC) {
            res = model.clone();
            diff =
                (isMoment(input) || isDate(input)
                    ? input.valueOf()
                    : createLocal(input).valueOf()) - res.valueOf();
            // Use low-level api, because this fn is low-level api.
            res._d.setTime(res._d.valueOf() + diff);
            hooks.updateOffset(res, false);
            return res;
        } else {
            return createLocal(input).local();
        }
    }

    function getDateOffset(m) {
        // On Firefox.24 Date#getTimezoneOffset returns a floating point.
        // https://github.com/moment/moment/pull/1871
        return -Math.round(m._d.getTimezoneOffset());
    }

    // HOOKS

    // This function will be called whenever a moment is mutated.
    // It is intended to keep the offset in sync with the timezone.
    hooks.updateOffset = function () {};

    // MOMENTS

    // keepLocalTime = true means only change the timezone, without
    // affecting the local hour. So 5:31:26 +0300 --[utcOffset(2, true)]--&gt;
    // 5:31:26 +0200 It is possible that 5:31:26 doesn&#039;t exist with offset
    // +0200, so we adjust the time as needed, to be valid.
    //
    // Keeping the time actually adds/subtracts (one hour)
    // from the actual represented time. That is why we call updateOffset
    // a second time. In case it wants us to change the offset again
    // _changeInProgress == true case, then we have to adjust, because
    // there is no such time in the given timezone.
    function getSetOffset(input, keepLocalTime, keepMinutes) {
        var offset = this._offset || 0,
            localAdjust;
        if (!this.isValid()) {
            return input != null ? this : NaN;
        }
        if (input != null) {
            if (typeof input === &#039;string&#039;) {
                input = offsetFromString(matchShortOffset, input);
                if (input === null) {
                    return this;
                }
            } else if (Math.abs(input) &lt; 16 &amp;&amp; !keepMinutes) {
                input = input * 60;
            }
            if (!this._isUTC &amp;&amp; keepLocalTime) {
                localAdjust = getDateOffset(this);
            }
            this._offset = input;
            this._isUTC = true;
            if (localAdjust != null) {
                this.add(localAdjust, &#039;m&#039;);
            }
            if (offset !== input) {
                if (!keepLocalTime || this._changeInProgress) {
                    addSubtract(
                        this,
                        createDuration(input - offset, &#039;m&#039;),
                        1,
                        false
                    );
                } else if (!this._changeInProgress) {
                    this._changeInProgress = true;
                    hooks.updateOffset(this, true);
                    this._changeInProgress = null;
                }
            }
            return this;
        } else {
            return this._isUTC ? offset : getDateOffset(this);
        }
    }

    function getSetZone(input, keepLocalTime) {
        if (input != null) {
            if (typeof input !== &#039;string&#039;) {
                input = -input;
            }

            this.utcOffset(input, keepLocalTime);

            return this;
        } else {
            return -this.utcOffset();
        }
    }

    function setOffsetToUTC(keepLocalTime) {
        return this.utcOffset(0, keepLocalTime);
    }

    function setOffsetToLocal(keepLocalTime) {
        if (this._isUTC) {
            this.utcOffset(0, keepLocalTime);
            this._isUTC = false;

            if (keepLocalTime) {
                this.subtract(getDateOffset(this), &#039;m&#039;);
            }
        }
        return this;
    }

    function setOffsetToParsedOffset() {
        if (this._tzm != null) {
            this.utcOffset(this._tzm, false, true);
        } else if (typeof this._i === &#039;string&#039;) {
            var tZone = offsetFromString(matchOffset, this._i);
            if (tZone != null) {
                this.utcOffset(tZone);
            } else {
                this.utcOffset(0, true);
            }
        }
        return this;
    }

    function hasAlignedHourOffset(input) {
        if (!this.isValid()) {
            return false;
        }
        input = input ? createLocal(input).utcOffset() : 0;

        return (this.utcOffset() - input) % 60 === 0;
    }

    function isDaylightSavingTime() {
        return (
            this.utcOffset() &gt; this.clone().month(0).utcOffset() ||
            this.utcOffset() &gt; this.clone().month(5).utcOffset()
        );
    }

    function isDaylightSavingTimeShifted() {
        if (!isUndefined(this._isDSTShifted)) {
            return this._isDSTShifted;
        }

        var c = {},
            other;

        copyConfig(c, this);
        c = prepareConfig(c);

        if (c._a) {
            other = c._isUTC ? createUTC(c._a) : createLocal(c._a);
            this._isDSTShifted =
                this.isValid() &amp;&amp; compareArrays(c._a, other.toArray()) &gt; 0;
        } else {
            this._isDSTShifted = false;
        }

        return this._isDSTShifted;
    }

    function isLocal() {
        return this.isValid() ? !this._isUTC : false;
    }

    function isUtcOffset() {
        return this.isValid() ? this._isUTC : false;
    }

    function isUtc() {
        return this.isValid() ? this._isUTC &amp;&amp; this._offset === 0 : false;
    }

    // ASP.NET json date format regex
    var aspNetRegex = /^(-|\+)?(?:(\d*)[. ])?(\d+):(\d+)(?::(\d+)(\.\d*)?)?$/,
        // from http://docs.closure-library.googlecode.com/git/closure_goog_date_date.js.source.html
        // somewhat more in line with 4.4.3.2 2004 spec, but allows decimal anywhere
        // and further modified to allow for strings containing both week and day
        isoRegex =
            /^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/;

    function createDuration(input, key) {
        var duration = input,
            // matching against regexp is expensive, do it on demand
            match = null,
            sign,
            ret,
            diffRes;

        if (isDuration(input)) {
            duration = {
                ms: input._milliseconds,
                d: input._days,
                M: input._months,
            };
        } else if (isNumber(input) || !isNaN(+input)) {
            duration = {};
            if (key) {
                duration[key] = +input;
            } else {
                duration.milliseconds = +input;
            }
        } else if ((match = aspNetRegex.exec(input))) {
            sign = match[1] === &#039;-&#039; ? -1 : 1;
            duration = {
                y: 0,
                d: toInt(match[DATE]) * sign,
                h: toInt(match[HOUR]) * sign,
                m: toInt(match[MINUTE]) * sign,
                s: toInt(match[SECOND]) * sign,
                ms: toInt(absRound(match[MILLISECOND] * 1000)) * sign, // the millisecond decimal point is included in the match
            };
        } else if ((match = isoRegex.exec(input))) {
            sign = match[1] === &#039;-&#039; ? -1 : 1;
            duration = {
                y: parseIso(match[2], sign),
                M: parseIso(match[3], sign),
                w: parseIso(match[4], sign),
                d: parseIso(match[5], sign),
                h: parseIso(match[6], sign),
                m: parseIso(match[7], sign),
                s: parseIso(match[8], sign),
            };
        } else if (duration == null) {
            // checks for null or undefined
            duration = {};
        } else if (
            typeof duration === &#039;object&#039; &amp;&amp;
            (&#039;from&#039; in duration || &#039;to&#039; in duration)
        ) {
            diffRes = momentsDifference(
                createLocal(duration.from),
                createLocal(duration.to)
            );

            duration = {};
            duration.ms = diffRes.milliseconds;
            duration.M = diffRes.months;
        }

        ret = new Duration(duration);

        if (isDuration(input) &amp;&amp; hasOwnProp(input, &#039;_locale&#039;)) {
            ret._locale = input._locale;
        }

        if (isDuration(input) &amp;&amp; hasOwnProp(input, &#039;_isValid&#039;)) {
            ret._isValid = input._isValid;
        }

        return ret;
    }

    createDuration.fn = Duration.prototype;
    createDuration.invalid = createInvalid$1;

    function parseIso(inp, sign) {
        // We&#039;d normally use ~~inp for this, but unfortunately it also
        // converts floats to ints.
        // inp may be undefined, so careful calling replace on it.
        var res = inp &amp;&amp; parseFloat(inp.replace(&#039;,&#039;, &#039;.&#039;));
        // apply sign while we&#039;re at it
        return (isNaN(res) ? 0 : res) * sign;
    }

    function positiveMomentsDifference(base, other) {
        var res = {};

        res.months =
            other.month() - base.month() + (other.year() - base.year()) * 12;
        if (base.clone().add(res.months, &#039;M&#039;).isAfter(other)) {
            --res.months;
        }

        res.milliseconds = +other - +base.clone().add(res.months, &#039;M&#039;);

        return res;
    }

    function momentsDifference(base, other) {
        var res;
        if (!(base.isValid() &amp;&amp; other.isValid())) {
            return { milliseconds: 0, months: 0 };
        }

        other = cloneWithOffset(other, base);
        if (base.isBefore(other)) {
            res = positiveMomentsDifference(base, other);
        } else {
            res = positiveMomentsDifference(other, base);
            res.milliseconds = -res.milliseconds;
            res.months = -res.months;
        }

        return res;
    }

    // TODO: remove &#039;name&#039; arg after deprecation is removed
    function createAdder(direction, name) {
        return function (val, period) {
            var dur, tmp;
            //invert the arguments, but complain about it
            if (period !== null &amp;&amp; !isNaN(+period)) {
                deprecateSimple(
                    name,
                    &#039;moment().&#039; +
                        name +
                        &#039;(period, number) is deprecated. Please use moment().&#039; +
                        name +
                        &#039;(number, period). &#039; +
                        &#039;See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.&#039;
                );
                tmp = val;
                val = period;
                period = tmp;
            }

            dur = createDuration(val, period);
            addSubtract(this, dur, direction);
            return this;
        };
    }

    function addSubtract(mom, duration, isAdding, updateOffset) {
        var milliseconds = duration._milliseconds,
            days = absRound(duration._days),
            months = absRound(duration._months);

        if (!mom.isValid()) {
            // No op
            return;
        }

        updateOffset = updateOffset == null ? true : updateOffset;

        if (months) {
            setMonth(mom, get(mom, &#039;Month&#039;) + months * isAdding);
        }
        if (days) {
            set$1(mom, &#039;Date&#039;, get(mom, &#039;Date&#039;) + days * isAdding);
        }
        if (milliseconds) {
            mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
        }
        if (updateOffset) {
            hooks.updateOffset(mom, days || months);
        }
    }

    var add = createAdder(1, &#039;add&#039;),
        subtract = createAdder(-1, &#039;subtract&#039;);

    function isString(input) {
        return typeof input === &#039;string&#039; || input instanceof String;
    }

    // type MomentInput = Moment | Date | string | number | (number | string)[] | MomentInputObject | void; // null | undefined
    function isMomentInput(input) {
        return (
            isMoment(input) ||
            isDate(input) ||
            isString(input) ||
            isNumber(input) ||
            isNumberOrStringArray(input) ||
            isMomentInputObject(input) ||
            input === null ||
            input === undefined
        );
    }

    function isMomentInputObject(input) {
        var objectTest = isObject(input) &amp;&amp; !isObjectEmpty(input),
            propertyTest = false,
            properties = [
                &#039;years&#039;,
                &#039;year&#039;,
                &#039;y&#039;,
                &#039;months&#039;,
                &#039;month&#039;,
                &#039;M&#039;,
                &#039;days&#039;,
                &#039;day&#039;,
                &#039;d&#039;,
                &#039;dates&#039;,
                &#039;date&#039;,
                &#039;D&#039;,
                &#039;hours&#039;,
                &#039;hour&#039;,
                &#039;h&#039;,
                &#039;minutes&#039;,
                &#039;minute&#039;,
                &#039;m&#039;,
                &#039;seconds&#039;,
                &#039;second&#039;,
                &#039;s&#039;,
                &#039;milliseconds&#039;,
                &#039;millisecond&#039;,
                &#039;ms&#039;,
            ],
            i,
            property,
            propertyLen = properties.length;

        for (i = 0; i &lt; propertyLen; i += 1) {
            property = properties[i];
            propertyTest = propertyTest || hasOwnProp(input, property);
        }

        return objectTest &amp;&amp; propertyTest;
    }

    function isNumberOrStringArray(input) {
        var arrayTest = isArray(input),
            dataTypeTest = false;
        if (arrayTest) {
            dataTypeTest =
                input.filter(function (item) {
                    return !isNumber(item) &amp;&amp; isString(input);
                }).length === 0;
        }
        return arrayTest &amp;&amp; dataTypeTest;
    }

    function isCalendarSpec(input) {
        var objectTest = isObject(input) &amp;&amp; !isObjectEmpty(input),
            propertyTest = false,
            properties = [
                &#039;sameDay&#039;,
                &#039;nextDay&#039;,
                &#039;lastDay&#039;,
                &#039;nextWeek&#039;,
                &#039;lastWeek&#039;,
                &#039;sameElse&#039;,
            ],
            i,
            property;

        for (i = 0; i &lt; properties.length; i += 1) {
            property = properties[i];
            propertyTest = propertyTest || hasOwnProp(input, property);
        }

        return objectTest &amp;&amp; propertyTest;
    }

    function getCalendarFormat(myMoment, now) {
        var diff = myMoment.diff(now, &#039;days&#039;, true);
        return diff &lt; -6
            ? &#039;sameElse&#039;
            : diff &lt; -1
              ? &#039;lastWeek&#039;
              : diff &lt; 0
                ? &#039;lastDay&#039;
                : diff &lt; 1
                  ? &#039;sameDay&#039;
                  : diff &lt; 2
                    ? &#039;nextDay&#039;
                    : diff &lt; 7
                      ? &#039;nextWeek&#039;
                      : &#039;sameElse&#039;;
    }

    function calendar$1(time, formats) {
        // Support for single parameter, formats only overload to the calendar function
        if (arguments.length === 1) {
            if (!arguments[0]) {
                time = undefined;
                formats = undefined;
            } else if (isMomentInput(arguments[0])) {
                time = arguments[0];
                formats = undefined;
            } else if (isCalendarSpec(arguments[0])) {
                formats = arguments[0];
                time = undefined;
            }
        }
        // We want to compare the start of today, vs this.
        // Getting start-of-today depends on whether we&#039;re local/utc/offset or not.
        var now = time || createLocal(),
            sod = cloneWithOffset(now, this).startOf(&#039;day&#039;),
            format = hooks.calendarFormat(this, sod) || &#039;sameElse&#039;,
            output =
                formats &amp;&amp;
                (isFunction(formats[format])
                    ? formats[format].call(this, now)
                    : formats[format]);

        return this.format(
            output || this.localeData().calendar(format, this, createLocal(now))
        );
    }

    function clone() {
        return new Moment(this);
    }

    function isAfter(input, units) {
        var localInput = isMoment(input) ? input : createLocal(input);
        if (!(this.isValid() &amp;&amp; localInput.isValid())) {
            return false;
        }
        units = normalizeUnits(units) || &#039;millisecond&#039;;
        if (units === &#039;millisecond&#039;) {
            return this.valueOf() &gt; localInput.valueOf();
        } else {
            return localInput.valueOf() &lt; this.clone().startOf(units).valueOf();
        }
    }

    function isBefore(input, units) {
        var localInput = isMoment(input) ? input : createLocal(input);
        if (!(this.isValid() &amp;&amp; localInput.isValid())) {
            return false;
        }
        units = normalizeUnits(units) || &#039;millisecond&#039;;
        if (units === &#039;millisecond&#039;) {
            return this.valueOf() &lt; localInput.valueOf();
        } else {
            return this.clone().endOf(units).valueOf() &lt; localInput.valueOf();
        }
    }

    function isBetween(from, to, units, inclusivity) {
        var localFrom = isMoment(from) ? from : createLocal(from),
            localTo = isMoment(to) ? to : createLocal(to);
        if (!(this.isValid() &amp;&amp; localFrom.isValid() &amp;&amp; localTo.isValid())) {
            return false;
        }
        inclusivity = inclusivity || &#039;()&#039;;
        return (
            (inclusivity[0] === &#039;(&#039;
                ? this.isAfter(localFrom, units)
                : !this.isBefore(localFrom, units)) &amp;&amp;
            (inclusivity[1] === &#039;)&#039;
                ? this.isBefore(localTo, units)
                : !this.isAfter(localTo, units))
        );
    }

    function isSame(input, units) {
        var localInput = isMoment(input) ? input : createLocal(input),
            inputMs;
        if (!(this.isValid() &amp;&amp; localInput.isValid())) {
            return false;
        }
        units = normalizeUnits(units) || &#039;millisecond&#039;;
        if (units === &#039;millisecond&#039;) {
            return this.valueOf() === localInput.valueOf();
        } else {
            inputMs = localInput.valueOf();
            return (
                this.clone().startOf(units).valueOf() &lt;= inputMs &amp;&amp;
                inputMs &lt;= this.clone().endOf(units).valueOf()
            );
        }
    }

    function isSameOrAfter(input, units) {
        return this.isSame(input, units) || this.isAfter(input, units);
    }

    function isSameOrBefore(input, units) {
        return this.isSame(input, units) || this.isBefore(input, units);
    }

    function diff(input, units, asFloat) {
        var that, zoneDelta, output;

        if (!this.isValid()) {
            return NaN;
        }

        that = cloneWithOffset(input, this);

        if (!that.isValid()) {
            return NaN;
        }

        zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;

        units = normalizeUnits(units);

        switch (units) {
            case &#039;year&#039;:
                output = monthDiff(this, that) / 12;
                break;
            case &#039;month&#039;:
                output = monthDiff(this, that);
                break;
            case &#039;quarter&#039;:
                output = monthDiff(this, that) / 3;
                break;
            case &#039;second&#039;:
                output = (this - that) / 1e3;
                break; // 1000
            case &#039;minute&#039;:
                output = (this - that) / 6e4;
                break; // 1000 * 60
            case &#039;hour&#039;:
                output = (this - that) / 36e5;
                break; // 1000 * 60 * 60
            case &#039;day&#039;:
                output = (this - that - zoneDelta) / 864e5;
                break; // 1000 * 60 * 60 * 24, negate dst
            case &#039;week&#039;:
                output = (this - that - zoneDelta) / 6048e5;
                break; // 1000 * 60 * 60 * 24 * 7, negate dst
            default:
                output = this - that;
        }

        return asFloat ? output : absFloor(output);
    }

    function monthDiff(a, b) {
        if (a.date() &lt; b.date()) {
            // end-of-month calculations work correct when the start month has more
            // days than the end month.
            return -monthDiff(b, a);
        }
        // difference in months
        var wholeMonthDiff = (b.year() - a.year()) * 12 + (b.month() - a.month()),
            // b is in (anchor - 1 month, anchor + 1 month)
            anchor = a.clone().add(wholeMonthDiff, &#039;months&#039;),
            anchor2,
            adjust;

        if (b - anchor &lt; 0) {
            anchor2 = a.clone().add(wholeMonthDiff - 1, &#039;months&#039;);
            // linear across the month
            adjust = (b - anchor) / (anchor - anchor2);
        } else {
            anchor2 = a.clone().add(wholeMonthDiff + 1, &#039;months&#039;);
            // linear across the month
            adjust = (b - anchor) / (anchor2 - anchor);
        }

        //check for negative zero, return zero if negative zero
        return -(wholeMonthDiff + adjust) || 0;
    }

    hooks.defaultFormat = &#039;YYYY-MM-DDTHH:mm:ssZ&#039;;
    hooks.defaultFormatUtc = &#039;YYYY-MM-DDTHH:mm:ss[Z]&#039;;

    function toString() {
        return this.clone().locale(&#039;en&#039;).format(&#039;ddd MMM DD YYYY HH:mm:ss [GMT]ZZ&#039;);
    }

    function toISOString(keepOffset) {
        if (!this.isValid()) {
            return null;
        }
        var utc = keepOffset !== true,
            m = utc ? this.clone().utc() : this;
        if (m.year() &lt; 0 || m.year() &gt; 9999) {
            return formatMoment(
                m,
                utc
                    ? &#039;YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]&#039;
                    : &#039;YYYYYY-MM-DD[T]HH:mm:ss.SSSZ&#039;
            );
        }
        if (isFunction(Date.prototype.toISOString)) {
            // native implementation is ~50x faster, use it when we can
            if (utc) {
                return this.toDate().toISOString();
            } else {
                return new Date(this.valueOf() + this.utcOffset() * 60 * 1000)
                    .toISOString()
                    .replace(&#039;Z&#039;, formatMoment(m, &#039;Z&#039;));
            }
        }
        return formatMoment(
            m,
            utc ? &#039;YYYY-MM-DD[T]HH:mm:ss.SSS[Z]&#039; : &#039;YYYY-MM-DD[T]HH:mm:ss.SSSZ&#039;
        );
    }

    /**
     * Return a human readable representation of a moment that can
     * also be evaluated to get a new moment which is the same
     *
     * @link https://nodejs.org/dist/latest/docs/api/util.html#util_custom_inspect_function_on_objects
     */
    function inspect() {
        if (!this.isValid()) {
            return &#039;moment.invalid(/* &#039; + this._i + &#039; */)&#039;;
        }
        var func = &#039;moment&#039;,
            zone = &#039;&#039;,
            prefix,
            year,
            datetime,
            suffix;
        if (!this.isLocal()) {
            func = this.utcOffset() === 0 ? &#039;moment.utc&#039; : &#039;moment.parseZone&#039;;
            zone = &#039;Z&#039;;
        }
        prefix = &#039;[&#039; + func + &#039;(&quot;]&#039;;
        year = 0 &lt;= this.year() &amp;&amp; this.year() &lt;= 9999 ? &#039;YYYY&#039; : &#039;YYYYYY&#039;;
        datetime = &#039;-MM-DD[T]HH:mm:ss.SSS&#039;;
        suffix = zone + &#039;[&quot;)]&#039;;

        return this.format(prefix + year + datetime + suffix);
    }

    function format(inputString) {
        if (!inputString) {
            inputString = this.isUtc()
                ? hooks.defaultFormatUtc
                : hooks.defaultFormat;
        }
        var output = formatMoment(this, inputString);
        return this.localeData().postformat(output);
    }

    function from(time, withoutSuffix) {
        if (
            this.isValid() &amp;&amp;
            ((isMoment(time) &amp;&amp; time.isValid()) || createLocal(time).isValid())
        ) {
            return createDuration({ to: this, from: time })
                .locale(this.locale())
                .humanize(!withoutSuffix);
        } else {
            return this.localeData().invalidDate();
        }
    }

    function fromNow(withoutSuffix) {
        return this.from(createLocal(), withoutSuffix);
    }

    function to(time, withoutSuffix) {
        if (
            this.isValid() &amp;&amp;
            ((isMoment(time) &amp;&amp; time.isValid()) || createLocal(time).isValid())
        ) {
            return createDuration({ from: this, to: time })
                .locale(this.locale())
                .humanize(!withoutSuffix);
        } else {
            return this.localeData().invalidDate();
        }
    }

    function toNow(withoutSuffix) {
        return this.to(createLocal(), withoutSuffix);
    }

    // If passed a locale key, it will set the locale for this
    // instance.  Otherwise, it will return the locale configuration
    // variables for this instance.
    function locale(key) {
        var newLocaleData;

        if (key === undefined) {
            return this._locale._abbr;
        } else {
            newLocaleData = getLocale(key);
            if (newLocaleData != null) {
                this._locale = newLocaleData;
            }
            return this;
        }
    }

    var lang = deprecate(
        &#039;moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.&#039;,
        function (key) {
            if (key === undefined) {
                return this.localeData();
            } else {
                return this.locale(key);
            }
        }
    );

    function localeData() {
        return this._locale;
    }

    var MS_PER_SECOND = 1000,
        MS_PER_MINUTE = 60 * MS_PER_SECOND,
        MS_PER_HOUR = 60 * MS_PER_MINUTE,
        MS_PER_400_YEARS = (365 * 400 + 97) * 24 * MS_PER_HOUR;

    // actual modulo - handles negative numbers (for dates before 1970):
    function mod$1(dividend, divisor) {
        return ((dividend % divisor) + divisor) % divisor;
    }

    function localStartOfDate(y, m, d) {
        // the date constructor remaps years 0-99 to 1900-1999
        if (y &lt; 100 &amp;&amp; y &gt;= 0) {
            // preserve leap years using a full 400 year cycle, then reset
            return new Date(y + 400, m, d) - MS_PER_400_YEARS;
        } else {
            return new Date(y, m, d).valueOf();
        }
    }

    function utcStartOfDate(y, m, d) {
        // Date.UTC remaps years 0-99 to 1900-1999
        if (y &lt; 100 &amp;&amp; y &gt;= 0) {
            // preserve leap years using a full 400 year cycle, then reset
            return Date.UTC(y + 400, m, d) - MS_PER_400_YEARS;
        } else {
            return Date.UTC(y, m, d);
        }
    }

    function startOf(units) {
        var time, startOfDate;
        units = normalizeUnits(units);
        if (units === undefined || units === &#039;millisecond&#039; || !this.isValid()) {
            return this;
        }

        startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

        switch (units) {
            case &#039;year&#039;:
                time = startOfDate(this.year(), 0, 1);
                break;
            case &#039;quarter&#039;:
                time = startOfDate(
                    this.year(),
                    this.month() - (this.month() % 3),
                    1
                );
                break;
            case &#039;month&#039;:
                time = startOfDate(this.year(), this.month(), 1);
                break;
            case &#039;week&#039;:
                time = startOfDate(
                    this.year(),
                    this.month(),
                    this.date() - this.weekday()
                );
                break;
            case &#039;isoWeek&#039;:
                time = startOfDate(
                    this.year(),
                    this.month(),
                    this.date() - (this.isoWeekday() - 1)
                );
                break;
            case &#039;day&#039;:
            case &#039;date&#039;:
                time = startOfDate(this.year(), this.month(), this.date());
                break;
            case &#039;hour&#039;:
                time = this._d.valueOf();
                time -= mod$1(
                    time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE),
                    MS_PER_HOUR
                );
                break;
            case &#039;minute&#039;:
                time = this._d.valueOf();
                time -= mod$1(time, MS_PER_MINUTE);
                break;
            case &#039;second&#039;:
                time = this._d.valueOf();
                time -= mod$1(time, MS_PER_SECOND);
                break;
        }

        this._d.setTime(time);
        hooks.updateOffset(this, true);
        return this;
    }

    function endOf(units) {
        var time, startOfDate;
        units = normalizeUnits(units);
        if (units === undefined || units === &#039;millisecond&#039; || !this.isValid()) {
            return this;
        }

        startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

        switch (units) {
            case &#039;year&#039;:
                time = startOfDate(this.year() + 1, 0, 1) - 1;
                break;
            case &#039;quarter&#039;:
                time =
                    startOfDate(
                        this.year(),
                        this.month() - (this.month() % 3) + 3,
                        1
                    ) - 1;
                break;
            case &#039;month&#039;:
                time = startOfDate(this.year(), this.month() + 1, 1) - 1;
                break;
            case &#039;week&#039;:
                time =
                    startOfDate(
                        this.year(),
                        this.month(),
                        this.date() - this.weekday() + 7
                    ) - 1;
                break;
            case &#039;isoWeek&#039;:
                time =
                    startOfDate(
                        this.year(),
                        this.month(),
                        this.date() - (this.isoWeekday() - 1) + 7
                    ) - 1;
                break;
            case &#039;day&#039;:
            case &#039;date&#039;:
                time = startOfDate(this.year(), this.month(), this.date() + 1) - 1;
                break;
            case &#039;hour&#039;:
                time = this._d.valueOf();
                time +=
                    MS_PER_HOUR -
                    mod$1(
                        time + (this._isUTC ? 0 : this.utcOffset() * MS_PER_MINUTE),
                        MS_PER_HOUR
                    ) -
                    1;
                break;
            case &#039;minute&#039;:
                time = this._d.valueOf();
                time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1;
                break;
            case &#039;second&#039;:
                time = this._d.valueOf();
                time += MS_PER_SECOND - mod$1(time, MS_PER_SECOND) - 1;
                break;
        }

        this._d.setTime(time);
        hooks.updateOffset(this, true);
        return this;
    }

    function valueOf() {
        return this._d.valueOf() - (this._offset || 0) * 60000;
    }

    function unix() {
        return Math.floor(this.valueOf() / 1000);
    }

    function toDate() {
        return new Date(this.valueOf());
    }

    function toArray() {
        var m = this;
        return [
            m.year(),
            m.month(),
            m.date(),
            m.hour(),
            m.minute(),
            m.second(),
            m.millisecond(),
        ];
    }

    function toObject() {
        var m = this;
        return {
            years: m.year(),
            months: m.month(),
            date: m.date(),
            hours: m.hours(),
            minutes: m.minutes(),
            seconds: m.seconds(),
            milliseconds: m.milliseconds(),
        };
    }

    function toJSON() {
        // new Date(NaN).toJSON() === null
        return this.isValid() ? this.toISOString() : null;
    }

    function isValid$2() {
        return isValid(this);
    }

    function parsingFlags() {
        return extend({}, getParsingFlags(this));
    }

    function invalidAt() {
        return getParsingFlags(this).overflow;
    }

    function creationData() {
        return {
            input: this._i,
            format: this._f,
            locale: this._locale,
            isUTC: this._isUTC,
            strict: this._strict,
        };
    }

    addFormatToken(&#039;N&#039;, 0, 0, &#039;eraAbbr&#039;);
    addFormatToken(&#039;NN&#039;, 0, 0, &#039;eraAbbr&#039;);
    addFormatToken(&#039;NNN&#039;, 0, 0, &#039;eraAbbr&#039;);
    addFormatToken(&#039;NNNN&#039;, 0, 0, &#039;eraName&#039;);
    addFormatToken(&#039;NNNNN&#039;, 0, 0, &#039;eraNarrow&#039;);

    addFormatToken(&#039;y&#039;, [&#039;y&#039;, 1], &#039;yo&#039;, &#039;eraYear&#039;);
    addFormatToken(&#039;y&#039;, [&#039;yy&#039;, 2], 0, &#039;eraYear&#039;);
    addFormatToken(&#039;y&#039;, [&#039;yyy&#039;, 3], 0, &#039;eraYear&#039;);
    addFormatToken(&#039;y&#039;, [&#039;yyyy&#039;, 4], 0, &#039;eraYear&#039;);

    addRegexToken(&#039;N&#039;, matchEraAbbr);
    addRegexToken(&#039;NN&#039;, matchEraAbbr);
    addRegexToken(&#039;NNN&#039;, matchEraAbbr);
    addRegexToken(&#039;NNNN&#039;, matchEraName);
    addRegexToken(&#039;NNNNN&#039;, matchEraNarrow);

    addParseToken(
        [&#039;N&#039;, &#039;NN&#039;, &#039;NNN&#039;, &#039;NNNN&#039;, &#039;NNNNN&#039;],
        function (input, array, config, token) {
            var era = config._locale.erasParse(input, token, config._strict);
            if (era) {
                getParsingFlags(config).era = era;
            } else {
                getParsingFlags(config).invalidEra = input;
            }
        }
    );

    addRegexToken(&#039;y&#039;, matchUnsigned);
    addRegexToken(&#039;yy&#039;, matchUnsigned);
    addRegexToken(&#039;yyy&#039;, matchUnsigned);
    addRegexToken(&#039;yyyy&#039;, matchUnsigned);
    addRegexToken(&#039;yo&#039;, matchEraYearOrdinal);

    addParseToken([&#039;y&#039;, &#039;yy&#039;, &#039;yyy&#039;, &#039;yyyy&#039;], YEAR);
    addParseToken([&#039;yo&#039;], function (input, array, config, token) {
        var match;
        if (config._locale._eraYearOrdinalRegex) {
            match = input.match(config._locale._eraYearOrdinalRegex);
        }

        if (config._locale.eraYearOrdinalParse) {
            array[YEAR] = config._locale.eraYearOrdinalParse(input, match);
        } else {
            array[YEAR] = parseInt(input, 10);
        }
    });

    function localeEras(m, format) {
        var i,
            l,
            date,
            eras = this._eras || getLocale(&#039;en&#039;)._eras;
        for (i = 0, l = eras.length; i &lt; l; ++i) {
            switch (typeof eras[i].since) {
                case &#039;string&#039;:
                    // truncate time
                    date = hooks(eras[i].since).startOf(&#039;day&#039;);
                    eras[i].since = date.valueOf();
                    break;
            }

            switch (typeof eras[i].until) {
                case &#039;undefined&#039;:
                    eras[i].until = +Infinity;
                    break;
                case &#039;string&#039;:
                    // truncate time
                    date = hooks(eras[i].until).startOf(&#039;day&#039;).valueOf();
                    eras[i].until = date.valueOf();
                    break;
            }
        }
        return eras;
    }

    function localeErasParse(eraName, format, strict) {
        var i,
            l,
            eras = this.eras(),
            name,
            abbr,
            narrow;
        eraName = eraName.toUpperCase();

        for (i = 0, l = eras.length; i &lt; l; ++i) {
            name = eras[i].name.toUpperCase();
            abbr = eras[i].abbr.toUpperCase();
            narrow = eras[i].narrow.toUpperCase();

            if (strict) {
                switch (format) {
                    case &#039;N&#039;:
                    case &#039;NN&#039;:
                    case &#039;NNN&#039;:
                        if (abbr === eraName) {
                            return eras[i];
                        }
                        break;

                    case &#039;NNNN&#039;:
                        if (name === eraName) {
                            return eras[i];
                        }
                        break;

                    case &#039;NNNNN&#039;:
                        if (narrow === eraName) {
                            return eras[i];
                        }
                        break;
                }
            } else if ([name, abbr, narrow].indexOf(eraName) &gt;= 0) {
                return eras[i];
            }
        }
    }

    function localeErasConvertYear(era, year) {
        var dir = era.since &lt;= era.until ? +1 : -1;
        if (year === undefined) {
            return hooks(era.since).year();
        } else {
            return hooks(era.since).year() + (year - era.offset) * dir;
        }
    }

    function getEraName() {
        var i,
            l,
            val,
            eras = this.localeData().eras();
        for (i = 0, l = eras.length; i &lt; l; ++i) {
            // truncate time
            val = this.clone().startOf(&#039;day&#039;).valueOf();

            if (eras[i].since &lt;= val &amp;&amp; val &lt;= eras[i].until) {
                return eras[i].name;
            }
            if (eras[i].until &lt;= val &amp;&amp; val &lt;= eras[i].since) {
                return eras[i].name;
            }
        }

        return &#039;&#039;;
    }

    function getEraNarrow() {
        var i,
            l,
            val,
            eras = this.localeData().eras();
        for (i = 0, l = eras.length; i &lt; l; ++i) {
            // truncate time
            val = this.clone().startOf(&#039;day&#039;).valueOf();

            if (eras[i].since &lt;= val &amp;&amp; val &lt;= eras[i].until) {
                return eras[i].narrow;
            }
            if (eras[i].until &lt;= val &amp;&amp; val &lt;= eras[i].since) {
                return eras[i].narrow;
            }
        }

        return &#039;&#039;;
    }

    function getEraAbbr() {
        var i,
            l,
            val,
            eras = this.localeData().eras();
        for (i = 0, l = eras.length; i &lt; l; ++i) {
            // truncate time
            val = this.clone().startOf(&#039;day&#039;).valueOf();

            if (eras[i].since &lt;= val &amp;&amp; val &lt;= eras[i].until) {
                return eras[i].abbr;
            }
            if (eras[i].until &lt;= val &amp;&amp; val &lt;= eras[i].since) {
                return eras[i].abbr;
            }
        }

        return &#039;&#039;;
    }

    function getEraYear() {
        var i,
            l,
            dir,
            val,
            eras = this.localeData().eras();
        for (i = 0, l = eras.length; i &lt; l; ++i) {
            dir = eras[i].since &lt;= eras[i].until ? +1 : -1;

            // truncate time
            val = this.clone().startOf(&#039;day&#039;).valueOf();

            if (
                (eras[i].since &lt;= val &amp;&amp; val &lt;= eras[i].until) ||
                (eras[i].until &lt;= val &amp;&amp; val &lt;= eras[i].since)
            ) {
                return (
                    (this.year() - hooks(eras[i].since).year()) * dir +
                    eras[i].offset
                );
            }
        }

        return this.year();
    }

    function erasNameRegex(isStrict) {
        if (!hasOwnProp(this, &#039;_erasNameRegex&#039;)) {
            computeErasParse.call(this);
        }
        return isStrict ? this._erasNameRegex : this._erasRegex;
    }

    function erasAbbrRegex(isStrict) {
        if (!hasOwnProp(this, &#039;_erasAbbrRegex&#039;)) {
            computeErasParse.call(this);
        }
        return isStrict ? this._erasAbbrRegex : this._erasRegex;
    }

    function erasNarrowRegex(isStrict) {
        if (!hasOwnProp(this, &#039;_erasNarrowRegex&#039;)) {
            computeErasParse.call(this);
        }
        return isStrict ? this._erasNarrowRegex : this._erasRegex;
    }

    function matchEraAbbr(isStrict, locale) {
        return locale.erasAbbrRegex(isStrict);
    }

    function matchEraName(isStrict, locale) {
        return locale.erasNameRegex(isStrict);
    }

    function matchEraNarrow(isStrict, locale) {
        return locale.erasNarrowRegex(isStrict);
    }

    function matchEraYearOrdinal(isStrict, locale) {
        return locale._eraYearOrdinalRegex || matchUnsigned;
    }

    function computeErasParse() {
        var abbrPieces = [],
            namePieces = [],
            narrowPieces = [],
            mixedPieces = [],
            i,
            l,
            erasName,
            erasAbbr,
            erasNarrow,
            eras = this.eras();

        for (i = 0, l = eras.length; i &lt; l; ++i) {
            erasName = regexEscape(eras[i].name);
            erasAbbr = regexEscape(eras[i].abbr);
            erasNarrow = regexEscape(eras[i].narrow);

            namePieces.push(erasName);
            abbrPieces.push(erasAbbr);
            narrowPieces.push(erasNarrow);
            mixedPieces.push(erasName);
            mixedPieces.push(erasAbbr);
            mixedPieces.push(erasNarrow);
        }

        this._erasRegex = new RegExp(&#039;^(&#039; + mixedPieces.join(&#039;|&#039;) + &#039;)&#039;, &#039;i&#039;);
        this._erasNameRegex = new RegExp(&#039;^(&#039; + namePieces.join(&#039;|&#039;) + &#039;)&#039;, &#039;i&#039;);
        this._erasAbbrRegex = new RegExp(&#039;^(&#039; + abbrPieces.join(&#039;|&#039;) + &#039;)&#039;, &#039;i&#039;);
        this._erasNarrowRegex = new RegExp(
            &#039;^(&#039; + narrowPieces.join(&#039;|&#039;) + &#039;)&#039;,
            &#039;i&#039;
        );
    }

    // FORMATTING

    addFormatToken(0, [&#039;gg&#039;, 2], 0, function () {
        return this.weekYear() % 100;
    });

    addFormatToken(0, [&#039;GG&#039;, 2], 0, function () {
        return this.isoWeekYear() % 100;
    });

    function addWeekYearFormatToken(token, getter) {
        addFormatToken(0, [token, token.length], 0, getter);
    }

    addWeekYearFormatToken(&#039;gggg&#039;, &#039;weekYear&#039;);
    addWeekYearFormatToken(&#039;ggggg&#039;, &#039;weekYear&#039;);
    addWeekYearFormatToken(&#039;GGGG&#039;, &#039;isoWeekYear&#039;);
    addWeekYearFormatToken(&#039;GGGGG&#039;, &#039;isoWeekYear&#039;);

    // ALIASES

    // PARSING

    addRegexToken(&#039;G&#039;, matchSigned);
    addRegexToken(&#039;g&#039;, matchSigned);
    addRegexToken(&#039;GG&#039;, match1to2, match2);
    addRegexToken(&#039;gg&#039;, match1to2, match2);
    addRegexToken(&#039;GGGG&#039;, match1to4, match4);
    addRegexToken(&#039;gggg&#039;, match1to4, match4);
    addRegexToken(&#039;GGGGG&#039;, match1to6, match6);
    addRegexToken(&#039;ggggg&#039;, match1to6, match6);

    addWeekParseToken(
        [&#039;gggg&#039;, &#039;ggggg&#039;, &#039;GGGG&#039;, &#039;GGGGG&#039;],
        function (input, week, config, token) {
            week[token.substr(0, 2)] = toInt(input);
        }
    );

    addWeekParseToken([&#039;gg&#039;, &#039;GG&#039;], function (input, week, config, token) {
        week[token] = hooks.parseTwoDigitYear(input);
    });

    // MOMENTS

    function getSetWeekYear(input) {
        return getSetWeekYearHelper.call(
            this,
            input,
            this.week(),
            this.weekday() + this.localeData()._week.dow,
            this.localeData()._week.dow,
            this.localeData()._week.doy
        );
    }

    function getSetISOWeekYear(input) {
        return getSetWeekYearHelper.call(
            this,
            input,
            this.isoWeek(),
            this.isoWeekday(),
            1,
            4
        );
    }

    function getISOWeeksInYear() {
        return weeksInYear(this.year(), 1, 4);
    }

    function getISOWeeksInISOWeekYear() {
        return weeksInYear(this.isoWeekYear(), 1, 4);
    }

    function getWeeksInYear() {
        var weekInfo = this.localeData()._week;
        return weeksInYear(this.year(), weekInfo.dow, weekInfo.doy);
    }

    function getWeeksInWeekYear() {
        var weekInfo = this.localeData()._week;
        return weeksInYear(this.weekYear(), weekInfo.dow, weekInfo.doy);
    }

    function getSetWeekYearHelper(input, week, weekday, dow, doy) {
        var weeksTarget;
        if (input == null) {
            return weekOfYear(this, dow, doy).year;
        } else {
            weeksTarget = weeksInYear(input, dow, doy);
            if (week &gt; weeksTarget) {
                week = weeksTarget;
            }
            return setWeekAll.call(this, input, week, weekday, dow, doy);
        }
    }

    function setWeekAll(weekYear, week, weekday, dow, doy) {
        var dayOfYearData = dayOfYearFromWeeks(weekYear, week, weekday, dow, doy),
            date = createUTCDate(dayOfYearData.year, 0, dayOfYearData.dayOfYear);

        this.year(date.getUTCFullYear());
        this.month(date.getUTCMonth());
        this.date(date.getUTCDate());
        return this;
    }

    // FORMATTING

    addFormatToken(&#039;Q&#039;, 0, &#039;Qo&#039;, &#039;quarter&#039;);

    // PARSING

    addRegexToken(&#039;Q&#039;, match1);
    addParseToken(&#039;Q&#039;, function (input, array) {
        array[MONTH] = (toInt(input) - 1) * 3;
    });

    // MOMENTS

    function getSetQuarter(input) {
        return input == null
            ? Math.ceil((this.month() + 1) / 3)
            : this.month((input - 1) * 3 + (this.month() % 3));
    }

    // FORMATTING

    addFormatToken(&#039;D&#039;, [&#039;DD&#039;, 2], &#039;Do&#039;, &#039;date&#039;);

    // PARSING

    addRegexToken(&#039;D&#039;, match1to2, match1to2NoLeadingZero);
    addRegexToken(&#039;DD&#039;, match1to2, match2);
    addRegexToken(&#039;Do&#039;, function (isStrict, locale) {
        // TODO: Remove &quot;ordinalParse&quot; fallback in next major release.
        return isStrict
            ? locale._dayOfMonthOrdinalParse || locale._ordinalParse
            : locale._dayOfMonthOrdinalParseLenient;
    });

    addParseToken([&#039;D&#039;, &#039;DD&#039;], DATE);
    addParseToken(&#039;Do&#039;, function (input, array) {
        array[DATE] = toInt(input.match(match1to2)[0]);
    });

    // MOMENTS

    var getSetDayOfMonth = makeGetSet(&#039;Date&#039;, true);

    // FORMATTING

    addFormatToken(&#039;DDD&#039;, [&#039;DDDD&#039;, 3], &#039;DDDo&#039;, &#039;dayOfYear&#039;);

    // PARSING

    addRegexToken(&#039;DDD&#039;, match1to3);
    addRegexToken(&#039;DDDD&#039;, match3);
    addParseToken([&#039;DDD&#039;, &#039;DDDD&#039;], function (input, array, config) {
        config._dayOfYear = toInt(input);
    });

    // HELPERS

    // MOMENTS

    function getSetDayOfYear(input) {
        var dayOfYear =
            Math.round(
                (this.clone().startOf(&#039;day&#039;) - this.clone().startOf(&#039;year&#039;)) / 864e5
            ) + 1;
        return input == null ? dayOfYear : this.add(input - dayOfYear, &#039;d&#039;);
    }

    // FORMATTING

    addFormatToken(&#039;m&#039;, [&#039;mm&#039;, 2], 0, &#039;minute&#039;);

    // PARSING

    addRegexToken(&#039;m&#039;, match1to2, match1to2HasZero);
    addRegexToken(&#039;mm&#039;, match1to2, match2);
    addParseToken([&#039;m&#039;, &#039;mm&#039;], MINUTE);

    // MOMENTS

    var getSetMinute = makeGetSet(&#039;Minutes&#039;, false);

    // FORMATTING

    addFormatToken(&#039;s&#039;, [&#039;ss&#039;, 2], 0, &#039;second&#039;);

    // PARSING

    addRegexToken(&#039;s&#039;, match1to2, match1to2HasZero);
    addRegexToken(&#039;ss&#039;, match1to2, match2);
    addParseToken([&#039;s&#039;, &#039;ss&#039;], SECOND);

    // MOMENTS

    var getSetSecond = makeGetSet(&#039;Seconds&#039;, false);

    // FORMATTING

    addFormatToken(&#039;S&#039;, 0, 0, function () {
        return ~~(this.millisecond() / 100);
    });

    addFormatToken(0, [&#039;SS&#039;, 2], 0, function () {
        return ~~(this.millisecond() / 10);
    });

    addFormatToken(0, [&#039;SSS&#039;, 3], 0, &#039;millisecond&#039;);
    addFormatToken(0, [&#039;SSSS&#039;, 4], 0, function () {
        return this.millisecond() * 10;
    });
    addFormatToken(0, [&#039;SSSSS&#039;, 5], 0, function () {
        return this.millisecond() * 100;
    });
    addFormatToken(0, [&#039;SSSSSS&#039;, 6], 0, function () {
        return this.millisecond() * 1000;
    });
    addFormatToken(0, [&#039;SSSSSSS&#039;, 7], 0, function () {
        return this.millisecond() * 10000;
    });
    addFormatToken(0, [&#039;SSSSSSSS&#039;, 8], 0, function () {
        return this.millisecond() * 100000;
    });
    addFormatToken(0, [&#039;SSSSSSSSS&#039;, 9], 0, function () {
        return this.millisecond() * 1000000;
    });

    // PARSING

    addRegexToken(&#039;S&#039;, match1to3, match1);
    addRegexToken(&#039;SS&#039;, match1to3, match2);
    addRegexToken(&#039;SSS&#039;, match1to3, match3);

    var token, getSetMillisecond;
    for (token = &#039;SSSS&#039;; token.length &lt;= 9; token += &#039;S&#039;) {
        addRegexToken(token, matchUnsigned);
    }

    function parseMs(input, array) {
        array[MILLISECOND] = toInt((&#039;0.&#039; + input) * 1000);
    }

    for (token = &#039;S&#039;; token.length &lt;= 9; token += &#039;S&#039;) {
        addParseToken(token, parseMs);
    }

    getSetMillisecond = makeGetSet(&#039;Milliseconds&#039;, false);

    // FORMATTING

    addFormatToken(&#039;z&#039;, 0, 0, &#039;zoneAbbr&#039;);
    addFormatToken(&#039;zz&#039;, 0, 0, &#039;zoneName&#039;);

    // MOMENTS

    function getZoneAbbr() {
        return this._isUTC ? &#039;UTC&#039; : &#039;&#039;;
    }

    function getZoneName() {
        return this._isUTC ? &#039;Coordinated Universal Time&#039; : &#039;&#039;;
    }

    var proto = Moment.prototype;

    proto.add = add;
    proto.calendar = calendar$1;
    proto.clone = clone;
    proto.diff = diff;
    proto.endOf = endOf;
    proto.format = format;
    proto.from = from;
    proto.fromNow = fromNow;
    proto.to = to;
    proto.toNow = toNow;
    proto.get = stringGet;
    proto.invalidAt = invalidAt;
    proto.isAfter = isAfter;
    proto.isBefore = isBefore;
    proto.isBetween = isBetween;
    proto.isSame = isSame;
    proto.isSameOrAfter = isSameOrAfter;
    proto.isSameOrBefore = isSameOrBefore;
    proto.isValid = isValid$2;
    proto.lang = lang;
    proto.locale = locale;
    proto.localeData = localeData;
    proto.max = prototypeMax;
    proto.min = prototypeMin;
    proto.parsingFlags = parsingFlags;
    proto.set = stringSet;
    proto.startOf = startOf;
    proto.subtract = subtract;
    proto.toArray = toArray;
    proto.toObject = toObject;
    proto.toDate = toDate;
    proto.toISOString = toISOString;
    proto.inspect = inspect;
    if (typeof Symbol !== &#039;undefined&#039; &amp;&amp; Symbol.for != null) {
        proto[Symbol.for(&#039;nodejs.util.inspect.custom&#039;)] = function () {
            return &#039;Moment&lt;&#039; + this.format() + &#039;&gt;&#039;;
        };
    }
    proto.toJSON = toJSON;
    proto.toString = toString;
    proto.unix = unix;
    proto.valueOf = valueOf;
    proto.creationData = creationData;
    proto.eraName = getEraName;
    proto.eraNarrow = getEraNarrow;
    proto.eraAbbr = getEraAbbr;
    proto.eraYear = getEraYear;
    proto.year = getSetYear;
    proto.isLeapYear = getIsLeapYear;
    proto.weekYear = getSetWeekYear;
    proto.isoWeekYear = getSetISOWeekYear;
    proto.quarter = proto.quarters = getSetQuarter;
    proto.month = getSetMonth;
    proto.daysInMonth = getDaysInMonth;
    proto.week = proto.weeks = getSetWeek;
    proto.isoWeek = proto.isoWeeks = getSetISOWeek;
    proto.weeksInYear = getWeeksInYear;
    proto.weeksInWeekYear = getWeeksInWeekYear;
    proto.isoWeeksInYear = getISOWeeksInYear;
    proto.isoWeeksInISOWeekYear = getISOWeeksInISOWeekYear;
    proto.date = getSetDayOfMonth;
    proto.day = proto.days = getSetDayOfWeek;
    proto.weekday = getSetLocaleDayOfWeek;
    proto.isoWeekday = getSetISODayOfWeek;
    proto.dayOfYear = getSetDayOfYear;
    proto.hour = proto.hours = getSetHour;
    proto.minute = proto.minutes = getSetMinute;
    proto.second = proto.seconds = getSetSecond;
    proto.millisecond = proto.milliseconds = getSetMillisecond;
    proto.utcOffset = getSetOffset;
    proto.utc = setOffsetToUTC;
    proto.local = setOffsetToLocal;
    proto.parseZone = setOffsetToParsedOffset;
    proto.hasAlignedHourOffset = hasAlignedHourOffset;
    proto.isDST = isDaylightSavingTime;
    proto.isLocal = isLocal;
    proto.isUtcOffset = isUtcOffset;
    proto.isUtc = isUtc;
    proto.isUTC = isUtc;
    proto.zoneAbbr = getZoneAbbr;
    proto.zoneName = getZoneName;
    proto.dates = deprecate(
        &#039;dates accessor is deprecated. Use date instead.&#039;,
        getSetDayOfMonth
    );
    proto.months = deprecate(
        &#039;months accessor is deprecated. Use month instead&#039;,
        getSetMonth
    );
    proto.years = deprecate(
        &#039;years accessor is deprecated. Use year instead&#039;,
        getSetYear
    );
    proto.zone = deprecate(
        &#039;moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/&#039;,
        getSetZone
    );
    proto.isDSTShifted = deprecate(
        &#039;isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information&#039;,
        isDaylightSavingTimeShifted
    );

    function createUnix(input) {
        return createLocal(input * 1000);
    }

    function createInZone() {
        return createLocal.apply(null, arguments).parseZone();
    }

    function preParsePostFormat(string) {
        return string;
    }

    var proto$1 = Locale.prototype;

    proto$1.calendar = calendar;
    proto$1.longDateFormat = longDateFormat;
    proto$1.invalidDate = invalidDate;
    proto$1.ordinal = ordinal;
    proto$1.preparse = preParsePostFormat;
    proto$1.postformat = preParsePostFormat;
    proto$1.relativeTime = relativeTime;
    proto$1.pastFuture = pastFuture;
    proto$1.set = set;
    proto$1.eras = localeEras;
    proto$1.erasParse = localeErasParse;
    proto$1.erasConvertYear = localeErasConvertYear;
    proto$1.erasAbbrRegex = erasAbbrRegex;
    proto$1.erasNameRegex = erasNameRegex;
    proto$1.erasNarrowRegex = erasNarrowRegex;

    proto$1.months = localeMonths;
    proto$1.monthsShort = localeMonthsShort;
    proto$1.monthsParse = localeMonthsParse;
    proto$1.monthsRegex = monthsRegex;
    proto$1.monthsShortRegex = monthsShortRegex;
    proto$1.week = localeWeek;
    proto$1.firstDayOfYear = localeFirstDayOfYear;
    proto$1.firstDayOfWeek = localeFirstDayOfWeek;

    proto$1.weekdays = localeWeekdays;
    proto$1.weekdaysMin = localeWeekdaysMin;
    proto$1.weekdaysShort = localeWeekdaysShort;
    proto$1.weekdaysParse = localeWeekdaysParse;

    proto$1.weekdaysRegex = weekdaysRegex;
    proto$1.weekdaysShortRegex = weekdaysShortRegex;
    proto$1.weekdaysMinRegex = weekdaysMinRegex;

    proto$1.isPM = localeIsPM;
    proto$1.meridiem = localeMeridiem;

    function get$1(format, index, field, setter) {
        var locale = getLocale(),
            utc = createUTC().set(setter, index);
        return locale[field](utc, format);
    }

    function listMonthsImpl(format, index, field) {
        if (isNumber(format)) {
            index = format;
            format = undefined;
        }

        format = format || &#039;&#039;;

        if (index != null) {
            return get$1(format, index, field, &#039;month&#039;);
        }

        var i,
            out = [];
        for (i = 0; i &lt; 12; i++) {
            out[i] = get$1(format, i, field, &#039;month&#039;);
        }
        return out;
    }

    // ()
    // (5)
    // (fmt, 5)
    // (fmt)
    // (true)
    // (true, 5)
    // (true, fmt, 5)
    // (true, fmt)
    function listWeekdaysImpl(localeSorted, format, index, field) {
        if (typeof localeSorted === &#039;boolean&#039;) {
            if (isNumber(format)) {
                index = format;
                format = undefined;
            }

            format = format || &#039;&#039;;
        } else {
            format = localeSorted;
            index = format;
            localeSorted = false;

            if (isNumber(format)) {
                index = format;
                format = undefined;
            }

            format = format || &#039;&#039;;
        }

        var locale = getLocale(),
            shift = localeSorted ? locale._week.dow : 0,
            i,
            out = [];

        if (index != null) {
            return get$1(format, (index + shift) % 7, field, &#039;day&#039;);
        }

        for (i = 0; i &lt; 7; i++) {
            out[i] = get$1(format, (i + shift) % 7, field, &#039;day&#039;);
        }
        return out;
    }

    function listMonths(format, index) {
        return listMonthsImpl(format, index, &#039;months&#039;);
    }

    function listMonthsShort(format, index) {
        return listMonthsImpl(format, index, &#039;monthsShort&#039;);
    }

    function listWeekdays(localeSorted, format, index) {
        return listWeekdaysImpl(localeSorted, format, index, &#039;weekdays&#039;);
    }

    function listWeekdaysShort(localeSorted, format, index) {
        return listWeekdaysImpl(localeSorted, format, index, &#039;weekdaysShort&#039;);
    }

    function listWeekdaysMin(localeSorted, format, index) {
        return listWeekdaysImpl(localeSorted, format, index, &#039;weekdaysMin&#039;);
    }

    getSetGlobalLocale(&#039;en&#039;, {
        eras: [
            {
                since: &#039;0001-01-01&#039;,
                until: +Infinity,
                offset: 1,
                name: &#039;Anno Domini&#039;,
                narrow: &#039;AD&#039;,
                abbr: &#039;AD&#039;,
            },
            {
                since: &#039;0000-12-31&#039;,
                until: -Infinity,
                offset: 1,
                name: &#039;Before Christ&#039;,
                narrow: &#039;BC&#039;,
                abbr: &#039;BC&#039;,
            },
        ],
        dayOfMonthOrdinalParse: /\d{1,2}(th|st|nd|rd)/,
        ordinal: function (number) {
            var b = number % 10,
                output =
                    toInt((number % 100) / 10) === 1
                        ? &#039;th&#039;
                        : b === 1
                          ? &#039;st&#039;
                          : b === 2
                            ? &#039;nd&#039;
                            : b === 3
                              ? &#039;rd&#039;
                              : &#039;th&#039;;
            return number + output;
        },
    });

    // Side effect imports

    hooks.lang = deprecate(
        &#039;moment.lang is deprecated. Use moment.locale instead.&#039;,
        getSetGlobalLocale
    );
    hooks.langData = deprecate(
        &#039;moment.langData is deprecated. Use moment.localeData instead.&#039;,
        getLocale
    );

    var mathAbs = Math.abs;

    function abs() {
        var data = this._data;

        this._milliseconds = mathAbs(this._milliseconds);
        this._days = mathAbs(this._days);
        this._months = mathAbs(this._months);

        data.milliseconds = mathAbs(data.milliseconds);
        data.seconds = mathAbs(data.seconds);
        data.minutes = mathAbs(data.minutes);
        data.hours = mathAbs(data.hours);
        data.months = mathAbs(data.months);
        data.years = mathAbs(data.years);

        return this;
    }

    function addSubtract$1(duration, input, value, direction) {
        var other = createDuration(input, value);

        duration._milliseconds += direction * other._milliseconds;
        duration._days += direction * other._days;
        duration._months += direction * other._months;

        return duration._bubble();
    }

    // supports only 2.0-style add(1, &#039;s&#039;) or add(duration)
    function add$1(input, value) {
        return addSubtract$1(this, input, value, 1);
    }

    // supports only 2.0-style subtract(1, &#039;s&#039;) or subtract(duration)
    function subtract$1(input, value) {
        return addSubtract$1(this, input, value, -1);
    }

    function absCeil(number) {
        if (number &lt; 0) {
            return Math.floor(number);
        } else {
            return Math.ceil(number);
        }
    }

    function bubble() {
        var milliseconds = this._milliseconds,
            days = this._days,
            months = this._months,
            data = this._data,
            seconds,
            minutes,
            hours,
            years,
            monthsFromDays;

        // if we have a mix of positive and negative values, bubble down first
        // check: https://github.com/moment/moment/issues/2166
        if (
            !(
                (milliseconds &gt;= 0 &amp;&amp; days &gt;= 0 &amp;&amp; months &gt;= 0) ||
                (milliseconds &lt;= 0 &amp;&amp; days &lt;= 0 &amp;&amp; months &lt;= 0)
            )
        ) {
            milliseconds += absCeil(monthsToDays(months) + days) * 864e5;
            days = 0;
            months = 0;
        }

        // The following code bubbles up values, see the tests for
        // examples of what that means.
        data.milliseconds = milliseconds % 1000;

        seconds = absFloor(milliseconds / 1000);
        data.seconds = seconds % 60;

        minutes = absFloor(seconds / 60);
        data.minutes = minutes % 60;

        hours = absFloor(minutes / 60);
        data.hours = hours % 24;

        days += absFloor(hours / 24);

        // convert days to months
        monthsFromDays = absFloor(daysToMonths(days));
        months += monthsFromDays;
        days -= absCeil(monthsToDays(monthsFromDays));

        // 12 months -&gt; 1 year
        years = absFloor(months / 12);
        months %= 12;

        data.days = days;
        data.months = months;
        data.years = years;

        return this;
    }

    function daysToMonths(days) {
        // 400 years have 146097 days (taking into account leap year rules)
        // 400 years have 12 months === 4800
        return (days * 4800) / 146097;
    }

    function monthsToDays(months) {
        // the reverse of daysToMonths
        return (months * 146097) / 4800;
    }

    function as(units) {
        if (!this.isValid()) {
            return NaN;
        }
        var days,
            months,
            milliseconds = this._milliseconds;

        units = normalizeUnits(units);

        if (units === &#039;month&#039; || units === &#039;quarter&#039; || units === &#039;year&#039;) {
            days = this._days + milliseconds / 864e5;
            months = this._months + daysToMonths(days);
            switch (units) {
                case &#039;month&#039;:
                    return months;
                case &#039;quarter&#039;:
                    return months / 3;
                case &#039;year&#039;:
                    return months / 12;
            }
        } else {
            // handle milliseconds separately because of floating point math errors (issue #1867)
            days = this._days + Math.round(monthsToDays(this._months));
            switch (units) {
                case &#039;week&#039;:
                    return days / 7 + milliseconds / 6048e5;
                case &#039;day&#039;:
                    return days + milliseconds / 864e5;
                case &#039;hour&#039;:
                    return days * 24 + milliseconds / 36e5;
                case &#039;minute&#039;:
                    return days * 1440 + milliseconds / 6e4;
                case &#039;second&#039;:
                    return days * 86400 + milliseconds / 1000;
                // Math.floor prevents floating point math errors here
                case &#039;millisecond&#039;:
                    return Math.floor(days * 864e5) + milliseconds;
                default:
                    throw new Error(&#039;Unknown unit &#039; + units);
            }
        }
    }

    function makeAs(alias) {
        return function () {
            return this.as(alias);
        };
    }

    var asMilliseconds = makeAs(&#039;ms&#039;),
        asSeconds = makeAs(&#039;s&#039;),
        asMinutes = makeAs(&#039;m&#039;),
        asHours = makeAs(&#039;h&#039;),
        asDays = makeAs(&#039;d&#039;),
        asWeeks = makeAs(&#039;w&#039;),
        asMonths = makeAs(&#039;M&#039;),
        asQuarters = makeAs(&#039;Q&#039;),
        asYears = makeAs(&#039;y&#039;),
        valueOf$1 = asMilliseconds;

    function clone$1() {
        return createDuration(this);
    }

    function get$2(units) {
        units = normalizeUnits(units);
        return this.isValid() ? this[units + &#039;s&#039;]() : NaN;
    }

    function makeGetter(name) {
        return function () {
            return this.isValid() ? this._data[name] : NaN;
        };
    }

    var milliseconds = makeGetter(&#039;milliseconds&#039;),
        seconds = makeGetter(&#039;seconds&#039;),
        minutes = makeGetter(&#039;minutes&#039;),
        hours = makeGetter(&#039;hours&#039;),
        days = makeGetter(&#039;days&#039;),
        months = makeGetter(&#039;months&#039;),
        years = makeGetter(&#039;years&#039;);

    function weeks() {
        return absFloor(this.days() / 7);
    }

    var round = Math.round,
        thresholds = {
            ss: 44, // a few seconds to seconds
            s: 45, // seconds to minute
            m: 45, // minutes to hour
            h: 22, // hours to day
            d: 26, // days to month/week
            w: null, // weeks to month
            M: 11, // months to year
        };

    // helper function for moment.fn.from, moment.fn.fromNow, and moment.duration.fn.humanize
    function substituteTimeAgo(string, number, withoutSuffix, isFuture, locale) {
        return locale.relativeTime(number || 1, !!withoutSuffix, string, isFuture);
    }

    function relativeTime$1(posNegDuration, withoutSuffix, thresholds, locale) {
        var duration = createDuration(posNegDuration).abs(),
            seconds = round(duration.as(&#039;s&#039;)),
            minutes = round(duration.as(&#039;m&#039;)),
            hours = round(duration.as(&#039;h&#039;)),
            days = round(duration.as(&#039;d&#039;)),
            months = round(duration.as(&#039;M&#039;)),
            weeks = round(duration.as(&#039;w&#039;)),
            years = round(duration.as(&#039;y&#039;)),
            a =
                (seconds &lt;= thresholds.ss &amp;&amp; [&#039;s&#039;, seconds]) ||
                (seconds &lt; thresholds.s &amp;&amp; [&#039;ss&#039;, seconds]) ||
                (minutes &lt;= 1 &amp;&amp; [&#039;m&#039;]) ||
                (minutes &lt; thresholds.m &amp;&amp; [&#039;mm&#039;, minutes]) ||
                (hours &lt;= 1 &amp;&amp; [&#039;h&#039;]) ||
                (hours &lt; thresholds.h &amp;&amp; [&#039;hh&#039;, hours]) ||
                (days &lt;= 1 &amp;&amp; [&#039;d&#039;]) ||
                (days &lt; thresholds.d &amp;&amp; [&#039;dd&#039;, days]);

        if (thresholds.w != null) {
            a =
                a ||
                (weeks &lt;= 1 &amp;&amp; [&#039;w&#039;]) ||
                (weeks &lt; thresholds.w &amp;&amp; [&#039;ww&#039;, weeks]);
        }
        a = a ||
            (months &lt;= 1 &amp;&amp; [&#039;M&#039;]) ||
            (months &lt; thresholds.M &amp;&amp; [&#039;MM&#039;, months]) ||
            (years &lt;= 1 &amp;&amp; [&#039;y&#039;]) || [&#039;yy&#039;, years];

        a[2] = withoutSuffix;
        a[3] = +posNegDuration &gt; 0;
        a[4] = locale;
        return substituteTimeAgo.apply(null, a);
    }

    // This function allows you to set the rounding function for relative time strings
    function getSetRelativeTimeRounding(roundingFunction) {
        if (roundingFunction === undefined) {
            return round;
        }
        if (typeof roundingFunction === &#039;function&#039;) {
            round = roundingFunction;
            return true;
        }
        return false;
    }

    // This function allows you to set a threshold for relative time strings
    function getSetRelativeTimeThreshold(threshold, limit) {
        if (thresholds[threshold] === undefined) {
            return false;
        }
        if (limit === undefined) {
            return thresholds[threshold];
        }
        thresholds[threshold] = limit;
        if (threshold === &#039;s&#039;) {
            thresholds.ss = limit - 1;
        }
        return true;
    }

    function humanize(argWithSuffix, argThresholds) {
        if (!this.isValid()) {
            return this.localeData().invalidDate();
        }

        var withSuffix = false,
            th = thresholds,
            locale,
            output;

        if (typeof argWithSuffix === &#039;object&#039;) {
            argThresholds = argWithSuffix;
            argWithSuffix = false;
        }
        if (typeof argWithSuffix === &#039;boolean&#039;) {
            withSuffix = argWithSuffix;
        }
        if (typeof argThresholds === &#039;object&#039;) {
            th = Object.assign({}, thresholds, argThresholds);
            if (argThresholds.s != null &amp;&amp; argThresholds.ss == null) {
                th.ss = argThresholds.s - 1;
            }
        }

        locale = this.localeData();
        output = relativeTime$1(this, !withSuffix, th, locale);

        if (withSuffix) {
            output = locale.pastFuture(+this, output);
        }

        return locale.postformat(output);
    }

    var abs$1 = Math.abs;

    function sign(x) {
        return (x &gt; 0) - (x &lt; 0) || +x;
    }

    function toISOString$1() {
        // for ISO strings we do not use the normal bubbling rules:
        //  * milliseconds bubble up until they become hours
        //  * days do not bubble at all
        //  * months bubble up until they become years
        // This is because there is no context-free conversion between hours and days
        // (think of clock changes)
        // and also not between days and months (28-31 days per month)
        if (!this.isValid()) {
            return this.localeData().invalidDate();
        }

        var seconds = abs$1(this._milliseconds) / 1000,
            days = abs$1(this._days),
            months = abs$1(this._months),
            minutes,
            hours,
            years,
            s,
            total = this.asSeconds(),
            totalSign,
            ymSign,
            daysSign,
            hmsSign;

        if (!total) {
            // this is the same as C#&#039;s (Noda) and python (isodate)...
            // but not other JS (goog.date)
            return &#039;P0D&#039;;
        }

        // 3600 seconds -&gt; 60 minutes -&gt; 1 hour
        minutes = absFloor(seconds / 60);
        hours = absFloor(minutes / 60);
        seconds %= 60;
        minutes %= 60;

        // 12 months -&gt; 1 year
        years = absFloor(months / 12);
        months %= 12;

        // inspired by https://github.com/dordille/moment-isoduration/blob/master/moment.isoduration.js
        s = seconds ? seconds.toFixed(3).replace(/\.?0+$/, &#039;&#039;) : &#039;&#039;;

        totalSign = total &lt; 0 ? &#039;-&#039; : &#039;&#039;;
        ymSign = sign(this._months) !== sign(total) ? &#039;-&#039; : &#039;&#039;;
        daysSign = sign(this._days) !== sign(total) ? &#039;-&#039; : &#039;&#039;;
        hmsSign = sign(this._milliseconds) !== sign(total) ? &#039;-&#039; : &#039;&#039;;

        return (
            totalSign +
            &#039;P&#039; +
            (years ? ymSign + years + &#039;Y&#039; : &#039;&#039;) +
            (months ? ymSign + months + &#039;M&#039; : &#039;&#039;) +
            (days ? daysSign + days + &#039;D&#039; : &#039;&#039;) +
            (hours || minutes || seconds ? &#039;T&#039; : &#039;&#039;) +
            (hours ? hmsSign + hours + &#039;H&#039; : &#039;&#039;) +
            (minutes ? hmsSign + minutes + &#039;M&#039; : &#039;&#039;) +
            (seconds ? hmsSign + s + &#039;S&#039; : &#039;&#039;)
        );
    }

    var proto$2 = Duration.prototype;

    proto$2.isValid = isValid$1;
    proto$2.abs = abs;
    proto$2.add = add$1;
    proto$2.subtract = subtract$1;
    proto$2.as = as;
    proto$2.asMilliseconds = asMilliseconds;
    proto$2.asSeconds = asSeconds;
    proto$2.asMinutes = asMinutes;
    proto$2.asHours = asHours;
    proto$2.asDays = asDays;
    proto$2.asWeeks = asWeeks;
    proto$2.asMonths = asMonths;
    proto$2.asQuarters = asQuarters;
    proto$2.asYears = asYears;
    proto$2.valueOf = valueOf$1;
    proto$2._bubble = bubble;
    proto$2.clone = clone$1;
    proto$2.get = get$2;
    proto$2.milliseconds = milliseconds;
    proto$2.seconds = seconds;
    proto$2.minutes = minutes;
    proto$2.hours = hours;
    proto$2.days = days;
    proto$2.weeks = weeks;
    proto$2.months = months;
    proto$2.years = years;
    proto$2.humanize = humanize;
    proto$2.toISOString = toISOString$1;
    proto$2.toString = toISOString$1;
    proto$2.toJSON = toISOString$1;
    proto$2.locale = locale;
    proto$2.localeData = localeData;

    proto$2.toIsoString = deprecate(
        &#039;toIsoString() is deprecated. Please use toISOString() instead (notice the capitals)&#039;,
        toISOString$1
    );
    proto$2.lang = lang;

    // FORMATTING

    addFormatToken(&#039;X&#039;, 0, 0, &#039;unix&#039;);
    addFormatToken(&#039;x&#039;, 0, 0, &#039;valueOf&#039;);

    // PARSING

    addRegexToken(&#039;x&#039;, matchSigned);
    addRegexToken(&#039;X&#039;, matchTimestamp);
    addParseToken(&#039;X&#039;, function (input, array, config) {
        config._d = new Date(parseFloat(input) * 1000);
    });
    addParseToken(&#039;x&#039;, function (input, array, config) {
        config._d = new Date(toInt(input));
    });

    //! moment.js

    hooks.version = &#039;2.30.1&#039;;

    setHookCallback(createLocal);

    hooks.fn = proto;
    hooks.min = min;
    hooks.max = max;
    hooks.now = now;
    hooks.utc = createUTC;
    hooks.unix = createUnix;
    hooks.months = listMonths;
    hooks.isDate = isDate;
    hooks.locale = getSetGlobalLocale;
    hooks.invalid = createInvalid;
    hooks.duration = createDuration;
    hooks.isMoment = isMoment;
    hooks.weekdays = listWeekdays;
    hooks.parseZone = createInZone;
    hooks.localeData = getLocale;
    hooks.isDuration = isDuration;
    hooks.monthsShort = listMonthsShort;
    hooks.weekdaysMin = listWeekdaysMin;
    hooks.defineLocale = defineLocale;
    hooks.updateLocale = updateLocale;
    hooks.locales = listLocales;
    hooks.weekdaysShort = listWeekdaysShort;
    hooks.normalizeUnits = normalizeUnits;
    hooks.relativeTimeRounding = getSetRelativeTimeRounding;
    hooks.relativeTimeThreshold = getSetRelativeTimeThreshold;
    hooks.calendarFormat = getCalendarFormat;
    hooks.prototype = proto;

    // currently HTML5 input type only supports 24-hour formats
    hooks.HTML5_FMT = {
        DATETIME_LOCAL: &#039;YYYY-MM-DDTHH:mm&#039;, // &lt;input type=&quot;datetime-local&quot; /&gt;
        DATETIME_LOCAL_SECONDS: &#039;YYYY-MM-DDTHH:mm:ss&#039;, // &lt;input type=&quot;datetime-local&quot; step=&quot;1&quot; /&gt;
        DATETIME_LOCAL_MS: &#039;YYYY-MM-DDTHH:mm:ss.SSS&#039;, // &lt;input type=&quot;datetime-local&quot; step=&quot;0.001&quot; /&gt;
        DATE: &#039;YYYY-MM-DD&#039;, // &lt;input type=&quot;date&quot; /&gt;
        TIME: &#039;HH:mm&#039;, // &lt;input type=&quot;time&quot; /&gt;
        TIME_SECONDS: &#039;HH:mm:ss&#039;, // &lt;input type=&quot;time&quot; step=&quot;1&quot; /&gt;
        TIME_MS: &#039;HH:mm:ss.SSS&#039;, // &lt;input type=&quot;time&quot; step=&quot;0.001&quot; /&gt;
        WEEK: &#039;GGGG-[W]WW&#039;, // &lt;input type=&quot;week&quot; /&gt;
        MONTH: &#039;YYYY-MM&#039;, // &lt;input type=&quot;month&quot; /&gt;
    };

    return hooks;

})));
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