index.js

            var t = Object(this),
                len = t.length >>> 0,
                i;

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

            return false;
        };
    }

    function isValid(m) {
        if (m._isValid == null) {
            var flags = getParsingFlags(m),
                parsedParts = some.call(flags.parsedDateParts, function (i) {
                    return i != null;
                }),
                isNowValid =
                    !isNaN(m._d.getTime()) &&
                    flags.overflow < 0 &&
                    !flags.empty &&
                    !flags.invalidEra &&
                    !flags.invalidMonth &&
                    !flags.invalidWeekday &&
                    !flags.weekdayMismatch &&
                    !flags.nullInput &&
                    !flags.invalidFormat &&
                    !flags.userInvalidated &&
                    (!flags.meridiem || (flags.meridiem && parsedParts));

            if (m._strict) {
                isNowValid =
                    isNowValid &&
                    flags.charsLeftOver === 0 &&
                    flags.unusedTokens.length === 0 &&
                    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;

        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 (momentProperties.length > 0) {
            for (i = 0; i < momentProperties.length; 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 && obj._isAMomentObject != null)
        );
    }

    function warn(msg) {
        if (
            hooks.suppressDeprecationWarnings === false &&
            typeof console !== 'undefined' &&
            console.warn
        ) {
            console.warn('Deprecation warning: ' + 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;
                for (i = 0; i < arguments.length; i++) {
                    arg = '';
                    if (typeof arguments[i] === 'object') {
                        arg += '\n[' + i + '] ';
                        for (key in arguments[0]) {
                            if (hasOwnProp(arguments[0], key)) {
                                arg += key + ': ' + arguments[0][key] + ', ';
                            }
                        }
                        arg = arg.slice(0, -2); // Remove trailing comma and space
                    } else {
                        arg = arguments[i];
                    }
                    args.push(arg);
                }
                warn(
                    msg +
                        '\nArguments: ' +
                        Array.prototype.slice.call(args).join('') +
                        '\n' +
                        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 !== 'undefined' && input instanceof Function) ||
            Object.prototype.toString.call(input) === '[object Function]'
        );
    }

    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['_' + i] = prop;
                }
            }
        }
        this._config = config;
        // Lenient ordinal parsing accepts just a number in addition to
        // number + (possibly) stuff coming from _dayOfMonthOrdinalParse.
        // TODO: Remove "ordinalParse" fallback in next major release.
        this._dayOfMonthOrdinalParseLenient = new RegExp(
            (this._dayOfMonthOrdinalParse.source || this._ordinalParse.source) +
                '|' +
                /\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]) && 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) &&
                !hasOwnProp(childConfig, prop) &&
                isObject(parentConfig[prop])
            ) {
                // make sure changes to properties don'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: '[Today at] LT',
        nextDay: '[Tomorrow at] LT',
        nextWeek: 'dddd [at] LT',
        lastDay: '[Yesterday at] LT',
        lastWeek: '[Last] dddd [at] LT',
        sameElse: 'L',
    };

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

    function zeroFill(number, targetLength, forceSign) {
        var absNumber = '' + Math.abs(number),
            zerosToFill = targetLength - absNumber.length,
            sign = number >= 0;
        return (
            (sign ? (forceSign ? '+' : '') : '-') +
            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:    'M'
    // padded:   ['MM', 2]
    // ordinal:  'Mo'
    // callback: function () { this.month() + 1 }
    function addFormatToken(token, padded, ordinal, callback) {
        var func = callback;
        if (typeof callback === 'string') {
            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, '');
        }
        return input.replace(/\\/g, '');
    }

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

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

        return function (mom) {
            var output = '',
                i;
            for (i = 0; i < 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 >= 0 && localFormattingTokens.test(format)) {
            format = format.replace(
                localFormattingTokens,
                replaceLongDateFormatTokens
            );
            localFormattingTokens.lastIndex = 0;
            i -= 1;
        }

        return format;
    }

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

    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 === 'MMMM' ||
                    tok === 'MM' ||
                    tok === 'DD' ||
                    tok === 'dddd'
                ) {
                    return tok.slice(1);
                }
                return tok;
            })
            .join('');

        return this._longDateFormat[key];
    }

    var defaultInvalidDate = 'Invalid date';

    function invalidDate() {
        return this._invalidDate;
    }

    var defaultOrdinal = '%d',
        defaultDayOfMonthOrdinalParse = /\d{1,2}/;

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

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

    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 > 0 ? 'future' : 'past'];
        return isFunction(format) ? format(output) : format.replace(/%s/i, output);
    }

    var aliases = {};

    function addUnitAlias(unit, shorthand) {
        var lowerCase = unit.toLowerCase();
        aliases[lowerCase] = aliases[lowerCase + 's'] = aliases[shorthand] = unit;
    }

    function normalizeUnits(units) {
        return typeof units === 'string'
            ? 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 = {};

    function addUnitPriority(unit, priority) {
        priorities[unit] = priority;
    }

    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;
    }

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

    function absFloor(number) {
        if (number < 0) {
            // -0 -> 0
            return Math.ceil(number) || 0;
        } else {
            return Math.floor(number);
        }
    }

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

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

        return value;
    }

    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) {
        return mom.isValid()
            ? mom._d['get' + (mom._isUTC ? 'UTC' : '') + unit]()
            : NaN;
    }

    function set$1(mom, unit, value) {
        if (mom.isValid() && !isNaN(value)) {
            if (
                unit === 'FullYear' &&
                isLeapYear(mom.year()) &&
                mom.month() === 1 &&
                mom.date() === 29
            ) {
                value = toInt(value);
                mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](
                    value,
                    mom.month(),
                    daysInMonth(value, mom.month())
                );
            } else {
                mom._d['set' + (mom._isUTC ? 'UTC' : '') + unit](value);
            }
        }
    }

    // MOMENTS

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

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

    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}['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,
        regexes;

    regexes = {};

    function addRegexToken(token, regex, strictRegex) {
        regexes[token] = isFunction(regex)
            ? regex
            : function (isStrict, localeData) {
                  return isStrict && 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('\\', '')
                .replace(/\\(\[)|\\(\])|\[([^\]\[]*)\]|\\(.)/g, function (
                    matched,
                    p1,
                    p2,
                    p3,
                    p4
                ) {
                    return p1 || p2 || p3 || p4;
                })
        );
    }

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

    var tokens = {};

    function addParseToken(token, callback) {
        var i,
            func = callback;
        if (typeof token === 'string') {
            token = [token];
        }
        if (isNumber(callback)) {
            func = function (input, array) {
                array[callback] = toInt(input);
            };
        }
        for (i = 0; i < token.length; 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 && hasOwnProp(tokens, token)) {
            tokens[token](input, config._a, config, token);
        }
    }

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

    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 < 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('M', ['MM', 2], 'Mo', function () {
        return this.month() + 1;
    });

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

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

    // ALIASES

    addUnitAlias('month', 'M');

    // PRIORITY

    addUnitPriority('month', 8);

    // PARSING

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

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

    addParseToken(['MMM', 'MMMM'], function (input, array, config, token) {
        var month = config._locale.monthsParse(input, token, config._strict);
        // if we didn't find a month name, mark the date as invalid.
        if (month != null) {
            array[MONTH] = month;
        } else {
            getParsingFlags(config).invalidMonth = input;
        }
    });

    // LOCALES

    var defaultLocaleMonths = 'January_February_March_April_May_June_July_August_September_October_November_December'.split(
            '_'
        ),
        defaultLocaleMonthsShort = 'Jan_Feb_Mar_Apr_May_Jun_Jul_Aug_Sep_Oct_Nov_Dec'.split(
            '_'
        ),
        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['standalone'];
        }
        return isArray(this._months)
            ? this._months[m.month()]
            : this._months[
                  (this._months.isFormat || MONTHS_IN_FORMAT).test(format)
                      ? 'format'
                      : 'standalone'
              ][m.month()];
    }

    function localeMonthsShort(m, format) {
        if (!m) {
            return isArray(this._monthsShort)
                ? this._monthsShort
                : this._monthsShort['standalone'];
        }
        return isArray(this._monthsShort)
            ? this._monthsShort[m.month()]
            : this._monthsShort[
                  MONTHS_IN_FORMAT.test(format) ? 'format' : 'standalone'
              ][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 < 12; ++i) {
                mom = createUTC([2000, i]);
                this._shortMonthsParse[i] = this.monthsShort(
                    mom,
                    ''
                ).toLocaleLowerCase();
                this._longMonthsParse[i] = this.months(mom, '').toLocaleLowerCase();
            }
        }

        if (strict) {
            if (format === 'MMM') {
                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 === 'MMM') {
                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 < 12; i++) {
            // make the regex if we don't have it already
            mom = createUTC([2000, i]);
            if (strict && !this._longMonthsParse[i]) {
                this._longMonthsParse[i] = new RegExp(
                    '^' + this.months(mom, '').replace('.', '') + '$',
                    'i'
                );
                this._shortMonthsParse[i] = new RegExp(
                    '^' + this.monthsShort(mom, '').replace('.', '') + '$',
                    'i'
                );
            }
            if (!strict && !this._monthsParse[i]) {
                regex =
                    '^' + this.months(mom, '') + '|^' + this.monthsShort(mom, '');
                this._monthsParse[i] = new RegExp(regex.replace('.', ''), 'i');
            }
            // test the regex
            if (
                strict &&
                format === 'MMMM' &&
                this._longMonthsParse[i].test(monthName)
            ) {
                return i;
            } else if (
                strict &&
                format === 'MMM' &&
                this._shortMonthsParse[i].test(monthName)
            ) {
                return i;
            } else if (!strict && this._monthsParse[i].test(monthName)) {
                return i;
            }
        }
    }

    // MOMENTS

    function setMonth(mom, value) {
        var dayOfMonth;

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

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

        dayOfMonth = Math.min(mom.date(), daysInMonth(mom.year(), value));
        mom._d['set' + (mom._isUTC ? 'UTC' : '') + 'Month'](value, dayOfMonth);
        return mom;
    }

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

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

    function monthsShortRegex(isStrict) {
        if (this._monthsParseExact) {
            if (!hasOwnProp(this, '_monthsRegex')) {
                computeMonthsParse.call(this);
            }
            if (isStrict) {
                return this._monthsShortStrictRegex;
            } else {
                return this._monthsShortRegex;
            }
        } else {
            if (!hasOwnProp(this, '_monthsShortRegex')) {
                this._monthsShortRegex = defaultMonthsShortRegex;