//! moment.js
//! version : 2.29.1
//! authors : Tim Wood, Iskren Chernev, Moment.js contributors
//! license : MIT
//! momentjs.com

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

  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) === '[object Array]'
    );
  }

  function isObject(input) {
    // IE8 will treat undefined and null as object if it wasn't for
    // input != null
    return (
      input != null &&
      Object.prototype.toString.call(input) === '[object Object]'
    );
  }

  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 === 'number' ||
      Object.prototype.toString.call(input) === '[object Number]'
    );
  }

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

  function map(arr, fn) {
    var res = [],
      i;
    for (i = 0; i < arr.length; ++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, 'toString')) {
      a.toString = b.toString;
    }

    if (hasOwnProp(b, 'valueOf')) {
      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 >>> 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;
      }
      return this._monthsShortStrictRegex && isStrict
        ? this._monthsShortStrictRegex
        : this._monthsShortRegex;
    }
  }

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

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

    var shortPieces = [],
      longPieces = [],
      mixedPieces = [],
      i,
      mom;
    for (i = 0; i < 12; i++) {
      // make the regex if we don't have it already
      mom = createUTC([2000, i]);
      shortPieces.push(this.monthsShort(mom, ''));
      longPieces.push(this.months(mom, ''));
      mixedPieces.push(this.months(mom, ''));
      mixedPieces.push(this.monthsShort(mom, ''));
    }
    // 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);
    for (i = 0; i < 12; i++) {
      shortPieces[i] = regexEscape(shortPieces[i]);
      longPieces[i] = regexEscape(longPieces[i]);
    }
    for (i = 0; i < 24; i++) {
      mixedPieces[i] = regexEscape(mixedPieces[i]);
    }

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

  // FORMATTING

  addFormatToken('Y', 0, 0, function () {
    var y = this.year();
    return y <= 9999 ? zeroFill(y, 4) : '+' + y;
  });

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

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

  // ALIASES

  addUnitAlias('year', 'y');

  // PRIORITIES

  addUnitPriority('year', 1);

  // PARSING

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

  addParseToken(['YYYYY', 'YYYYYY'], YEAR);
  addParseToken('YYYY', function (input, array) {
    array[YEAR] =
      input.length === 2 ? hooks.parseTwoDigitYear(input) : toInt(input);
  });
  addParseToken('YY', function (input, array) {
    array[YEAR] = hooks.parseTwoDigitYear(input);
  });
  addParseToken('Y', 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) > 68 ? 1900 : 2000);
  };

  // MOMENTS

  var getSetYear = makeGetSet('FullYear', true);

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

  function createDate(y, m, d, h, M, s, ms) {
    // can'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 < 100 && y >= 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 < 100 && y >= 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 <= 0) {
      resYear = year - 1;
      resDayOfYear = daysInYear(resYear) + dayOfYear;
    } else if (dayOfYear > 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 < 1) {
      resYear = mom.year() - 1;
      resWeek = week + weeksInYear(resYear, dow, doy);
    } else if (week > 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('w', ['ww', 2], 'wo', 'week');
  addFormatToken('W', ['WW', 2], 'Wo', 'isoWeek');

  // ALIASES

  addUnitAlias('week', 'w');
  addUnitAlias('isoWeek', 'W');

  // PRIORITIES

  addUnitPriority('week', 5);
  addUnitPriority('isoWeek', 5);

  // PARSING

  addRegexToken('w', match1to2);
  addRegexToken('ww', match1to2, match2);
  addRegexToken('W', match1to2);
  addRegexToken('WW', match1to2, match2);

  addWeekParseToken(
    ['w', 'ww', 'W', 'WW'],
    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, 'd');
  }

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

  // FORMATTING

  addFormatToken('d', 0, 'do', 'day');

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

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

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

  addFormatToken('e', 0, 0, 'weekday');
  addFormatToken('E', 0, 0, 'isoWeekday');

  // ALIASES

  addUnitAlias('day', 'd');
  addUnitAlias('weekday', 'e');
  addUnitAlias('isoWeekday', 'E');

  // PRIORITY
  addUnitPriority('day', 11);
  addUnitPriority('weekday', 11);
  addUnitPriority('isoWeekday', 11);

  // PARSING

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

  addWeekParseToken(
    ['dd', 'ddd', 'dddd'],
    function (input, week, config, token) {
      var weekday = config._locale.weekdaysParse(input, token, config._strict);
      // if we didn't get a weekday name, mark the date as invalid
      if (weekday != null) {
        week.d = weekday;
      } else {
        getParsingFlags(config).invalidWeekday = input;
      }
    }
  );

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

  // HELPERS

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

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

    input = locale.weekdaysParse(input);
    if (typeof input === 'number') {
      return input;
    }

    return null;
  }

  function parseIsoWeekday(input, locale) {
    if (typeof input === 'string') {
      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 = 'Sunday_Monday_Tuesday_Wednesday_Thursday_Friday_Saturday'.split(
      '_'
    ),
    defaultLocaleWeekdaysShort = 'Sun_Mon_Tue_Wed_Thu_Fri_Sat'.split('_'),
    defaultLocaleWeekdaysMin = 'Su_Mo_Tu_We_Th_Fr_Sa'.split('_'),
    defaultWeekdaysRegex = matchWord,
    defaultWeekdaysShortRegex = matchWord,
    defaultWeekdaysMinRegex = matchWord;

  function localeWeekdays(m, format) {
    var weekdays = isArray(this._weekdays)
      ? this._weekdays
      : this._weekdays[
          m && m !== true && this._weekdays.isFormat.test(format)
            ? 'format'
            : 'standalone'
        ];
    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 < 7; ++i) {
        mom = createUTC([2000, 1]).day(i);
        this._minWeekdaysParse[i] = this.weekdaysMin(
          mom,
          ''
        ).toLocaleLowerCase();
        this._shortWeekdaysParse[i] = this.weekdaysShort(
          mom,
          ''
        ).toLocaleLowerCase();
        this._weekdaysParse[i] = this.weekdays(mom, '').toLocaleLowerCase();
      }
    }

    if (strict) {
      if (format === 'dddd') {
        ii = indexOf.call(this._weekdaysParse, llc);
        return ii !== -1 ? ii : null;
      } else if (format === 'ddd') {
        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 === 'dddd') {
        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 === 'ddd') {
        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 < 7; i++) {
      // make the regex if we don't have it already

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

  // MOMENTS

  function getSetDayOfWeek(input) {
    if (!this.isValid()) {
      return input != null ? this : NaN;
    }
    var day = this._isUTC ? this._d.getUTCDay() : this._d.getDay();
    if (input != null) {
      input = parseWeekday(input, this.localeData());
      return this.add(input - day, 'd');
    } 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, 'd');
  }

  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, '_weekdaysRegex')) {
        computeWeekdaysParse.call(this);
      }
      if (isStrict) {
        return this._weekdaysStrictRegex;
      } else {
        return this._weekdaysRegex;
      }
    } else {
      if (!hasOwnProp(this, '_weekdaysRegex')) {
        this._weekdaysRegex = defaultWeekdaysRegex;
      }
      return this._weekdaysStrictRegex && isStrict
        ? this._weekdaysStrictRegex
        : this._weekdaysRegex;
    }
  }

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

  function weekdaysMinRegex(isStrict) {
    if (this._weekdaysParseExact) {
      if (!hasOwnProp(this, '_weekdaysRegex')) {
        computeWeekdaysParse.call(this);
      }
      if (isStrict) {
        return this._weekdaysMinStrictRegex;
      } else {
        return this._weekdaysMinRegex;
      }
    } else {
      if (!hasOwnProp(this, '_weekdaysMinRegex')) {
        this._weekdaysMinRegex = defaultWeekdaysMinRegex;
      }
      return this._weekdaysMinStrictRegex && 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 < 7; i++) {
      // make the regex if we don't have it already
      mom = createUTC([2000, 1]).day(i);
      minp = regexEscape(this.weekdaysMin(mom, ''));
      shortp = regexEscape(this.weekdaysShort(mom, ''));
      longp = regexEscape(this.weekdays(mom, ''));
      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('^(' + mixedPieces.join('|') + ')', 'i');
    this._weekdaysShortRegex = this._weekdaysRegex;
    this._weekdaysMinRegex = this._weekdaysRegex;

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

  // FORMATTING

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

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

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

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

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

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

  addFormatToken('Hmmss', 0, 0, function () {
    return (
      '' +
      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('a', true);
  meridiem('A', false);

  // ALIASES

  addUnitAlias('hour', 'h');

  // PRIORITY
  addUnitPriority('hour', 13);

  // PARSING

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

  addRegexToken('a', matchMeridiem);
  addRegexToken('A', matchMeridiem);
  addRegexToken('H', match1to2);
  addRegexToken('h', match1to2);
  addRegexToken('k', match1to2);
  addRegexToken('HH', match1to2, match2);
  addRegexToken('hh', match1to2, match2);
  addRegexToken('kk', match1to2, match2);

  addRegexToken('hmm', match3to4);
  addRegexToken('hmmss', match5to6);
  addRegexToken('Hmm', match3to4);
  addRegexToken('Hmmss', match5to6);

  addParseToken(['H', 'HH'], HOUR);
  addParseToken(['k', 'kk'], function (input, array, config) {
    var kInput = toInt(input);
    array[HOUR] = kInput === 24 ? 0 : kInput;
  });
  addParseToken(['a', 'A'], function (input, array, config) {
    config._isPm = config._locale.isPM(input);
    config._meridiem = input;
  });
  addParseToken(['h', 'hh'], function (input, array, config) {
    array[HOUR] = toInt(input);
    getParsingFlags(config).bigHour = true;
  });
  addParseToken('hmm', 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('hmmss', 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('Hmm', function (input, array, config) {
    var pos = input.length - 2;
    array[HOUR] = toInt(input.substr(0, pos));
    array[MINUTE] = toInt(input.substr(pos));
  });
  addParseToken('Hmmss', 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 & IE7 Standards Mode do not allow accessing strings like arrays
    // Using charAt should be more compatible.
    return (input + '').toLowerCase().charAt(0) === 'p';
  }

  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('Hours', true);

  function localeMeridiem(hours, minutes, isLower) {
    if (hours > 11) {
      return isLower ? 'pm' : 'PM';
    } else {
      return isLower ? 'am' : 'AM';
    }
  }

  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 < minl; i += 1) {
      if (arr1[i] !== arr2[i]) {
        return i;
      }
    }
    return minl;
  }

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

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

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

  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 &&
      typeof module !== 'undefined' &&
      module &&
      module.exports
    ) {
      try {
        oldLocale = globalLocale._abbr;
        aliasedRequire = require;
        aliasedRequire('./locale/' + 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 !== 'undefined' && console.warn) {
          //warn user if arguments are passed but the locale could not be set
          console.warn(
            'Locale ' + key + ' not found. Did you forget to load it?'
          );
        }
      }
    }

    return globalLocale._abbr;
  }

  function defineLocale(name, config) {
    if (config !== null) {
      var locale,
        parentConfig = baseConfig;
      config.abbr = name;
      if (locales[name] != null) {
        deprecateSimple(
          'defineLocaleOverride',
          'use moment.updateLocale(localeName, config) to change ' +
            'an existing locale. moment.defineLocale(localeName, ' +
            'config) should only be used for creating a new locale ' +
            'See http://momentjs.com/guides/#/warnings/define-locale/ for more info.'
        );
        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'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 && 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 && key._locale && 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 && getParsingFlags(m).overflow === -2) {
      overflow =
        a[MONTH] < 0 || a[MONTH] > 11
          ? MONTH
          : a[DATE] < 1 || a[DATE] > daysInMonth(a[YEAR], a[MONTH])
          ? DATE
          : a[HOUR] < 0 ||
            a[HOUR] > 24 ||
            (a[HOUR] === 24 &&
              (a[MINUTE] !== 0 || a[SECOND] !== 0 || a[MILLISECOND] !== 0))
          ? HOUR
          : a[MINUTE] < 0 || a[MINUTE] > 59
          ? MINUTE
          : a[SECOND] < 0 || a[SECOND] > 59
          ? SECOND
          : a[MILLISECOND] < 0 || a[MILLISECOND] > 999
          ? MILLISECOND
          : -1;

      if (
        getParsingFlags(m)._overflowDayOfYear &&
        (overflow < YEAR || overflow > DATE)
      ) {
        overflow = DATE;
      }
      if (getParsingFlags(m)._overflowWeeks && overflow === -1) {
        overflow = WEEK;
      }
      if (getParsingFlags(m)._overflowWeekday && 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 = [
      ['YYYYYY-MM-DD', /[+-]\d{6}-\d\d-\d\d/],
      ['YYYY-MM-DD', /\d{4}-\d\d-\d\d/],
      ['GGGG-[W]WW-E', /\d{4}-W\d\d-\d/],
      ['GGGG-[W]WW', /\d{4}-W\d\d/, false],
      ['YYYY-DDD', /\d{4}-\d{3}/],
      ['YYYY-MM', /\d{4}-\d\d/, false],
      ['YYYYYYMMDD', /[+-]\d{10}/],
      ['YYYYMMDD', /\d{8}/],
      ['GGGG[W]WWE', /\d{4}W\d{3}/],
      ['GGGG[W]WW', /\d{4}W\d{2}/, false],
      ['YYYYDDD', /\d{7}/],
      ['YYYYMM', /\d{6}/, false],
      ['YYYY', /\d{4}/, false],
    ],
    // iso time formats and regexes
    isoTimes = [
      ['HH:mm:ss.SSSS', /\d\d:\d\d:\d\d\.\d+/],
      ['HH:mm:ss,SSSS', /\d\d:\d\d:\d\d,\d+/],
      ['HH:mm:ss', /\d\d:\d\d:\d\d/],
      ['HH:mm', /\d\d:\d\d/],
      ['HHmmss.SSSS', /\d\d\d\d\d\d\.\d+/],
      ['HHmmss,SSSS', /\d\d\d\d\d\d,\d+/],
      ['HHmmss', /\d\d\d\d\d\d/],
      ['HHmm', /\d\d\d\d/],
      ['HH', /\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;

    if (match) {
      getParsingFlags(config).iso = true;

      for (i = 0, l = isoDates.length; i < 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 = isoTimes.length; i < l; i++) {
          if (isoTimes[i][1].exec(match[3])) {
            // match[2] should be 'T' or space
            timeFormat = (match[2] || ' ') + isoTimes[i][0];
            break;
          }
        }
        if (timeFormat == null) {
          config._isValid = false;
          return;
        }
      }
      if (!allowTime && timeFormat != null) {
        config._isValid = false;
        return;
      }
      if (match[4]) {
        if (tzRegex.exec(match[4])) {
          tzFormat = 'Z';
        } else {
          config._isValid = false;
          return;
        }
      }
      config._f = dateFormat + (timeFormat || '') + (tzFormat || '');
      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 <= 49) {
      return 2000 + year;
    } else if (year <= 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, ' ')
      .replace(/(\s\s+)/g, ' ')
      .replace(/^\s\s*/, '')
      .replace(/\s\s*$/, '');
  }

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

  // 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 && config._a[DATE] == null && 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 > 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't default anything
    for (i = 0; i < 3 && config._a[i] == null; ++i) {
      config._a[i] = input[i] = currentDate[i];
    }

    // Zero out whatever was not defaulted, including time
    for (; i < 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 &&
      config._a[MINUTE] === 0 &&
      config._a[SECOND] === 0 &&
      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 &&
      typeof config._w.d !== 'undefined' &&
      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 < 1 || weekday > 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 < 0 || weekday > 6) {
          weekdayOverflow = true;
        }
      } else if (w.e != null) {
        // local weekday -- counting starts from beginning of week
        weekday = w.e + dow;
        if (w.e < 0 || w.e > 6) {
          weekdayOverflow = true;
        }
      } else {
        // default to beginning of week
        weekday = dow;
      }
    }
    if (week < 1 || week > 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 = '' + config._i,
      i,
      parsedInput,
      tokens,
      token,
      skipped,
      stringLength = string.length,
      totalParsedInputLength = 0,
      era;

    tokens =
      expandFormat(config._f, config._locale).match(formattingTokens) || [];

    for (i = 0; i < tokens.length; i++) {
      token = tokens[i];
      parsedInput = (string.match(getParseRegexForToken(token, config)) ||
        [])[0];
      if (parsedInput) {
        skipped = string.substr(0, string.indexOf(parsedInput));
        if (skipped.length > 0) {
          getParsingFlags(config).unusedInput.push(skipped);
        }
        string = string.slice(string.indexOf(parsedInput) + parsedInput.length);
        totalParsedInputLength += parsedInput.length;
      }
      // don't parse if it'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 && !parsedInput) {
        getParsingFlags(config).unusedTokens.push(token);
      }
    }

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

    // clear _12h flag if hour is <= 12
    if (
      config._a[HOUR] <= 12 &&
      getParsingFlags(config).bigHour === true &&
      config._a[HOUR] > 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 && hour < 12) {
        hour += 12;
      }
      if (!isPm && 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;

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

    for (i = 0; i < config._f.length; 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 < scoreToBeat ||
          validFormatFound
        ) {
          scoreToBeat = currentScore;
          bestMoment = tempConfig;
          if (validFormatFound) {
            bestFormatIsValid = true;
          }
        }
      } else {
        if (currentScore < 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 && 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, 'd');
      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 && input === '')) {
      return createInvalid({ nullInput: true });
    }

    if (typeof input === 'string') {
      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 === 'string') {
      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) && isObjectEmpty(input)) ||
      (isArray(input) && 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(
      'moment().min is deprecated, use moment.max instead. http://momentjs.com/guides/#/warnings/min-max/',
      function () {
        var other = createLocal.apply(null, arguments);
        if (this.isValid() && other.isValid()) {
          return other < this ? this : other;
        } else {
          return createInvalid();
        }
      }
    ),
    prototypeMax = deprecate(
      'moment().max is deprecated, use moment.min instead. http://momentjs.com/guides/#/warnings/min-max/',
      function () {
        var other = createLocal.apply(null, arguments);
        if (this.isValid() && other.isValid()) {
          return other > 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 && isArray(moments[0])) {
      moments = moments[0];
    }
    if (!moments.length) {
      return createLocal();
    }
    res = moments[0];
    for (i = 1; i < 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('isBefore', args);
  }

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

    return pickBy('isAfter', args);
  }

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

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

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

    for (i = 0; i < ordering.length; ++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 < 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 < len; i++) {
      if (
        (dontConvert && array1[i] !== array2[i]) ||
        (!dontConvert && 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 = '+';
      if (offset < 0) {
        offset = -offset;
        sign = '-';
      }
      return (
        sign +
        zeroFill(~~(offset / 60), 2) +
        separator +
        zeroFill(~~offset % 60, 2)
      );
    });
  }

  offset('Z', ':');
  offset('ZZ', '');

  // PARSING

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

  // HELPERS

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

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

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

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

    return minutes === 0 ? 0 : parts[0] === '+' ? 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)]-->
  // 5:31:26 +0200 It is possible that 5:31:26 doesn'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 === 'string') {
        input = offsetFromString(matchShortOffset, input);
        if (input === null) {
          return this;
        }
      } else if (Math.abs(input) < 16 && !keepMinutes) {
        input = input * 60;
      }
      if (!this._isUTC && keepLocalTime) {
        localAdjust = getDateOffset(this);
      }
      this._offset = input;
      this._isUTC = true;
      if (localAdjust != null) {
        this.add(localAdjust, 'm');
      }
      if (offset !== input) {
        if (!keepLocalTime || this._changeInProgress) {
          addSubtract(this, createDuration(input - offset, 'm'), 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 !== 'string') {
        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), 'm');
      }
    }
    return this;
  }

  function setOffsetToParsedOffset() {
    if (this._tzm != null) {
      this.utcOffset(this._tzm, false, true);
    } else if (typeof this._i === 'string') {
      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() > this.clone().month(0).utcOffset() ||
      this.utcOffset() > 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() && compareArrays(c._a, other.toArray()) > 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 && 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] === '-' ? -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] === '-' ? -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 === 'object' &&
      ('from' in duration || 'to' 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) && hasOwnProp(input, '_locale')) {
      ret._locale = input._locale;
    }

    if (isDuration(input) && hasOwnProp(input, '_isValid')) {
      ret._isValid = input._isValid;
    }

    return ret;
  }

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

  function parseIso(inp, sign) {
    // We'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 && parseFloat(inp.replace(',', '.'));
    // apply sign while we'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, 'M').isAfter(other)) {
      --res.months;
    }

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

    return res;
  }

  function momentsDifference(base, other) {
    var res;
    if (!(base.isValid() && 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 'name' 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 && !isNaN(+period)) {
        deprecateSimple(
          name,
          'moment().' +
            name +
            '(period, number) is deprecated. Please use moment().' +
            name +
            '(number, period). ' +
            'See http://momentjs.com/guides/#/warnings/add-inverted-param/ for more info.'
        );
        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, 'Month') + months * isAdding);
    }
    if (days) {
      set$1(mom, 'Date', get(mom, 'Date') + days * isAdding);
    }
    if (milliseconds) {
      mom._d.setTime(mom._d.valueOf() + milliseconds * isAdding);
    }
    if (updateOffset) {
      hooks.updateOffset(mom, days || months);
    }
  }

  var add = createAdder(1, 'add'),
    subtract = createAdder(-1, 'subtract');

  function isString(input) {
    return typeof input === 'string' || 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) && !isObjectEmpty(input),
      propertyTest = false,
      properties = [
        'years',
        'year',
        'y',
        'months',
        'month',
        'M',
        'days',
        'day',
        'd',
        'dates',
        'date',
        'D',
        'hours',
        'hour',
        'h',
        'minutes',
        'minute',
        'm',
        'seconds',
        'second',
        's',
        'milliseconds',
        'millisecond',
        'ms',
      ],
      i,
      property;

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

    return objectTest && propertyTest;
  }

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

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

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

    return objectTest && propertyTest;
  }

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

  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're local/utc/offset or not.
    var now = time || createLocal(),
      sod = cloneWithOffset(now, this).startOf('day'),
      format = hooks.calendarFormat(this, sod) || 'sameElse',
      output =
        formats &&
        (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() && localInput.isValid())) {
      return false;
    }
    units = normalizeUnits(units) || 'millisecond';
    if (units === 'millisecond') {
      return this.valueOf() > localInput.valueOf();
    } else {
      return localInput.valueOf() < this.clone().startOf(units).valueOf();
    }
  }

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

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

  function isSame(input, units) {
    var localInput = isMoment(input) ? input : createLocal(input),
      inputMs;
    if (!(this.isValid() && localInput.isValid())) {
      return false;
    }
    units = normalizeUnits(units) || 'millisecond';
    if (units === 'millisecond') {
      return this.valueOf() === localInput.valueOf();
    } else {
      inputMs = localInput.valueOf();
      return (
        this.clone().startOf(units).valueOf() <= inputMs &&
        inputMs <= 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 'year':
        output = monthDiff(this, that) / 12;
        break;
      case 'month':
        output = monthDiff(this, that);
        break;
      case 'quarter':
        output = monthDiff(this, that) / 3;
        break;
      case 'second':
        output = (this - that) / 1e3;
        break; // 1000
      case 'minute':
        output = (this - that) / 6e4;
        break; // 1000 * 60
      case 'hour':
        output = (this - that) / 36e5;
        break; // 1000 * 60 * 60
      case 'day':
        output = (this - that - zoneDelta) / 864e5;
        break; // 1000 * 60 * 60 * 24, negate dst
      case 'week':
        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() < 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, 'months'),
      anchor2,
      adjust;

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

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

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

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

  function toISOString(keepOffset) {
    if (!this.isValid()) {
      return null;
    }
    var utc = keepOffset !== true,
      m = utc ? this.clone().utc() : this;
    if (m.year() < 0 || m.year() > 9999) {
      return formatMoment(
        m,
        utc ? 'YYYYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYYYY-MM-DD[T]HH:mm:ss.SSSZ'
      );
    }
    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('Z', formatMoment(m, 'Z'));
      }
    }
    return formatMoment(
      m,
      utc ? 'YYYY-MM-DD[T]HH:mm:ss.SSS[Z]' : 'YYYY-MM-DD[T]HH:mm:ss.SSSZ'
    );
  }

  /**
   * 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 'moment.invalid(/* ' + this._i + ' */)';
    }
    var func = 'moment',
      zone = '',
      prefix,
      year,
      datetime,
      suffix;
    if (!this.isLocal()) {
      func = this.utcOffset() === 0 ? 'moment.utc' : 'moment.parseZone';
      zone = 'Z';
    }
    prefix = '[' + func + '("]';
    year = 0 <= this.year() && this.year() <= 9999 ? 'YYYY' : 'YYYYYY';
    datetime = '-MM-DD[T]HH:mm:ss.SSS';
    suffix = zone + '[")]';

    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() &&
      ((isMoment(time) && 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() &&
      ((isMoment(time) && 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(
    'moment().lang() is deprecated. Instead, use moment().localeData() to get the language configuration. Use moment().locale() to change languages.',
    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 < 100 && y >= 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 < 100 && y >= 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 === 'millisecond' || !this.isValid()) {
      return this;
    }

    startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

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

    startOfDate = this._isUTC ? utcStartOfDate : localStartOfDate;

    switch (units) {
      case 'year':
        time = startOfDate(this.year() + 1, 0, 1) - 1;
        break;
      case 'quarter':
        time =
          startOfDate(this.year(), this.month() - (this.month() % 3) + 3, 1) -
          1;
        break;
      case 'month':
        time = startOfDate(this.year(), this.month() + 1, 1) - 1;
        break;
      case 'week':
        time =
          startOfDate(
            this.year(),
            this.month(),
            this.date() - this.weekday() + 7
          ) - 1;
        break;
      case 'isoWeek':
        time =
          startOfDate(
            this.year(),
            this.month(),
            this.date() - (this.isoWeekday() - 1) + 7
          ) - 1;
        break;
      case 'day':
      case 'date':
        time = startOfDate(this.year(), this.month(), this.date() + 1) - 1;
        break;
      case 'hour':
        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 'minute':
        time = this._d.valueOf();
        time += MS_PER_MINUTE - mod$1(time, MS_PER_MINUTE) - 1;
        break;
      case 'second':
        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('N', 0, 0, 'eraAbbr');
  addFormatToken('NN', 0, 0, 'eraAbbr');
  addFormatToken('NNN', 0, 0, 'eraAbbr');
  addFormatToken('NNNN', 0, 0, 'eraName');
  addFormatToken('NNNNN', 0, 0, 'eraNarrow');

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

  addRegexToken('N', matchEraAbbr);
  addRegexToken('NN', matchEraAbbr);
  addRegexToken('NNN', matchEraAbbr);
  addRegexToken('NNNN', matchEraName);
  addRegexToken('NNNNN', matchEraNarrow);

  addParseToken(
    ['N', 'NN', 'NNN', 'NNNN', 'NNNNN'],
    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('y', matchUnsigned);
  addRegexToken('yy', matchUnsigned);
  addRegexToken('yyy', matchUnsigned);
  addRegexToken('yyyy', matchUnsigned);
  addRegexToken('yo', matchEraYearOrdinal);

  addParseToken(['y', 'yy', 'yyy', 'yyyy'], YEAR);
  addParseToken(['yo'], 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('en')._eras;
    for (i = 0, l = eras.length; i < l; ++i) {
      switch (typeof eras[i].since) {
        case 'string':
          // truncate time
          date = hooks(eras[i].since).startOf('day');
          eras[i].since = date.valueOf();
          break;
      }

      switch (typeof eras[i].until) {
        case 'undefined':
          eras[i].until = +Infinity;
          break;
        case 'string':
          // truncate time
          date = hooks(eras[i].until).startOf('day').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 < l; ++i) {
      name = eras[i].name.toUpperCase();
      abbr = eras[i].abbr.toUpperCase();
      narrow = eras[i].narrow.toUpperCase();

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

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

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

  function localeErasConvertYear(era, year) {
    var dir = era.since <= 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 < l; ++i) {
      // truncate time
      val = this.clone().startOf('day').valueOf();

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

    return '';
  }

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

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

    return '';
  }

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

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

    return '';
  }

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

      // truncate time
      val = this.clone().startOf('day').valueOf();

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

    return this.year();
  }

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

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

  function erasNarrowRegex(isStrict) {
    if (!hasOwnProp(this, '_erasNarrowRegex')) {
      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,
      eras = this.eras();

    for (i = 0, l = eras.length; i < l; ++i) {
      namePieces.push(regexEscape(eras[i].name));
      abbrPieces.push(regexEscape(eras[i].abbr));
      narrowPieces.push(regexEscape(eras[i].narrow));

      mixedPieces.push(regexEscape(eras[i].name));
      mixedPieces.push(regexEscape(eras[i].abbr));
      mixedPieces.push(regexEscape(eras[i].narrow));
    }

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

  // FORMATTING

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

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

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

  addWeekYearFormatToken('gggg', 'weekYear');
  addWeekYearFormatToken('ggggg', 'weekYear');
  addWeekYearFormatToken('GGGG', 'isoWeekYear');
  addWeekYearFormatToken('GGGGG', 'isoWeekYear');

  // ALIASES

  addUnitAlias('weekYear', 'gg');
  addUnitAlias('isoWeekYear', 'GG');

  // PRIORITY

  addUnitPriority('weekYear', 1);
  addUnitPriority('isoWeekYear', 1);

  // PARSING

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

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

  addWeekParseToken(['gg', 'GG'], 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.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 > 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('Q', 0, 'Qo', 'quarter');

  // ALIASES

  addUnitAlias('quarter', 'Q');

  // PRIORITY

  addUnitPriority('quarter', 7);

  // PARSING

  addRegexToken('Q', match1);
  addParseToken('Q', 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('D', ['DD', 2], 'Do', 'date');

  // ALIASES

  addUnitAlias('date', 'D');

  // PRIORITY
  addUnitPriority('date', 9);

  // PARSING

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

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

  // MOMENTS

  var getSetDayOfMonth = makeGetSet('Date', true);

  // FORMATTING

  addFormatToken('DDD', ['DDDD', 3], 'DDDo', 'dayOfYear');

  // ALIASES

  addUnitAlias('dayOfYear', 'DDD');

  // PRIORITY
  addUnitPriority('dayOfYear', 4);

  // PARSING

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

  // HELPERS

  // MOMENTS

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

  // FORMATTING

  addFormatToken('m', ['mm', 2], 0, 'minute');

  // ALIASES

  addUnitAlias('minute', 'm');

  // PRIORITY

  addUnitPriority('minute', 14);

  // PARSING

  addRegexToken('m', match1to2);
  addRegexToken('mm', match1to2, match2);
  addParseToken(['m', 'mm'], MINUTE);

  // MOMENTS

  var getSetMinute = makeGetSet('Minutes', false);

  // FORMATTING

  addFormatToken('s', ['ss', 2], 0, 'second');

  // ALIASES

  addUnitAlias('second', 's');

  // PRIORITY

  addUnitPriority('second', 15);

  // PARSING

  addRegexToken('s', match1to2);
  addRegexToken('ss', match1to2, match2);
  addParseToken(['s', 'ss'], SECOND);

  // MOMENTS

  var getSetSecond = makeGetSet('Seconds', false);

  // FORMATTING

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

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

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

  // ALIASES

  addUnitAlias('millisecond', 'ms');

  // PRIORITY

  addUnitPriority('millisecond', 16);

  // PARSING

  addRegexToken('S', match1to3, match1);
  addRegexToken('SS', match1to3, match2);
  addRegexToken('SSS', match1to3, match3);

  var token, getSetMillisecond;
  for (token = 'SSSS'; token.length <= 9; token += 'S') {
    addRegexToken(token, matchUnsigned);
  }

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

  for (token = 'S'; token.length <= 9; token += 'S') {
    addParseToken(token, parseMs);
  }

  getSetMillisecond = makeGetSet('Milliseconds', false);

  // FORMATTING

  addFormatToken('z', 0, 0, 'zoneAbbr');
  addFormatToken('zz', 0, 0, 'zoneName');

  // MOMENTS

  function getZoneAbbr() {
    return this._isUTC ? 'UTC' : '';
  }

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

  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 !== 'undefined' && Symbol.for != null) {
    proto[Symbol.for('nodejs.util.inspect.custom')] = function () {
      return 'Moment<' + this.format() + '>';
    };
  }
  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(
    'dates accessor is deprecated. Use date instead.',
    getSetDayOfMonth
  );
  proto.months = deprecate(
    'months accessor is deprecated. Use month instead',
    getSetMonth
  );
  proto.years = deprecate(
    'years accessor is deprecated. Use year instead',
    getSetYear
  );
  proto.zone = deprecate(
    'moment().zone is deprecated, use moment().utcOffset instead. http://momentjs.com/guides/#/warnings/zone/',
    getSetZone
  );
  proto.isDSTShifted = deprecate(
    'isDSTShifted is deprecated. See http://momentjs.com/guides/#/warnings/dst-shifted/ for more information',
    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 || '';

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

    var i,
      out = [];
    for (i = 0; i < 12; i++) {
      out[i] = get$1(format, i, field, 'month');
    }
    return out;
  }

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

      format = format || '';
    } else {
      format = localeSorted;
      index = format;
      localeSorted = false;

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

      format = format || '';
    }

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

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

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

  function listMonths(format, index) {
    return listMonthsImpl(format, index, 'months');
  }

  function listMonthsShort(format, index) {
    return listMonthsImpl(format, index, 'monthsShort');
  }

  function listWeekdays(localeSorted, format, index) {
    return listWeekdaysImpl(localeSorted, format, index, 'weekdays');
  }

  function listWeekdaysShort(localeSorted, format, index) {
    return listWeekdaysImpl(localeSorted, format, index, 'weekdaysShort');
  }

  function listWeekdaysMin(localeSorted, format, index) {
    return listWeekdaysImpl(localeSorted, format, index, 'weekdaysMin');
  }

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

  // Side effect imports

  hooks.lang = deprecate(
    'moment.lang is deprecated. Use moment.locale instead.',
    getSetGlobalLocale
  );
  hooks.langData = deprecate(
    'moment.langData is deprecated. Use moment.localeData instead.',
    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, 's') or add(duration)
  function add$1(input, value) {
    return addSubtract$1(this, input, value, 1);
  }

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

  function absCeil(number) {
    if (number < 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 >= 0 && days >= 0 && months >= 0) ||
        (milliseconds <= 0 && days <= 0 && months <= 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 -> 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 === 'month' || units === 'quarter' || units === 'year') {
      days = this._days + milliseconds / 864e5;
      months = this._months + daysToMonths(days);
      switch (units) {
        case 'month':
          return months;
        case 'quarter':
          return months / 3;
        case 'year':
          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 'week':
          return days / 7 + milliseconds / 6048e5;
        case 'day':
          return days + milliseconds / 864e5;
        case 'hour':
          return days * 24 + milliseconds / 36e5;
        case 'minute':
          return days * 1440 + milliseconds / 6e4;
        case 'second':
          return days * 86400 + milliseconds / 1000;
        // Math.floor prevents floating point math errors here
        case 'millisecond':
          return Math.floor(days * 864e5) + milliseconds;
        default:
          throw new Error('Unknown unit ' + units);
      }
    }
  }

  // TODO: Use this.as('ms')?
  function valueOf$1() {
    if (!this.isValid()) {
      return NaN;
    }
    return (
      this._milliseconds +
      this._days * 864e5 +
      (this._months % 12) * 2592e6 +
      toInt(this._months / 12) * 31536e6
    );
  }

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

  var asMilliseconds = makeAs('ms'),
    asSeconds = makeAs('s'),
    asMinutes = makeAs('m'),
    asHours = makeAs('h'),
    asDays = makeAs('d'),
    asWeeks = makeAs('w'),
    asMonths = makeAs('M'),
    asQuarters = makeAs('Q'),
    asYears = makeAs('y');

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

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

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

  var milliseconds = makeGetter('milliseconds'),
    seconds = makeGetter('seconds'),
    minutes = makeGetter('minutes'),
    hours = makeGetter('hours'),
    days = makeGetter('days'),
    months = makeGetter('months'),
    years = makeGetter('years');

  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('s')),
      minutes = round(duration.as('m')),
      hours = round(duration.as('h')),
      days = round(duration.as('d')),
      months = round(duration.as('M')),
      weeks = round(duration.as('w')),
      years = round(duration.as('y')),
      a =
        (seconds <= thresholds.ss && ['s', seconds]) ||
        (seconds < thresholds.s && ['ss', seconds]) ||
        (minutes <= 1 && ['m']) ||
        (minutes < thresholds.m && ['mm', minutes]) ||
        (hours <= 1 && ['h']) ||
        (hours < thresholds.h && ['hh', hours]) ||
        (days <= 1 && ['d']) ||
        (days < thresholds.d && ['dd', days]);

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

    a[2] = withoutSuffix;
    a[3] = +posNegDuration > 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 === 'function') {
      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 === 's') {
      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 === 'object') {
      argThresholds = argWithSuffix;
      argWithSuffix = false;
    }
    if (typeof argWithSuffix === 'boolean') {
      withSuffix = argWithSuffix;
    }
    if (typeof argThresholds === 'object') {
      th = Object.assign({}, thresholds, argThresholds);
      if (argThresholds.s != null && 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 > 0) - (x < 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#'s (Noda) and python (isodate)...
      // but not other JS (goog.date)
      return 'P0D';
    }

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

    // 12 months -> 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+$/, '') : '';

    totalSign = total < 0 ? '-' : '';
    ymSign = sign(this._months) !== sign(total) ? '-' : '';
    daysSign = sign(this._days) !== sign(total) ? '-' : '';
    hmsSign = sign(this._milliseconds) !== sign(total) ? '-' : '';

    return (
      totalSign +
      'P' +
      (years ? ymSign + years + 'Y' : '') +
      (months ? ymSign + months + 'M' : '') +
      (days ? daysSign + days + 'D' : '') +
      (hours || minutes || seconds ? 'T' : '') +
      (hours ? hmsSign + hours + 'H' : '') +
      (minutes ? hmsSign + minutes + 'M' : '') +
      (seconds ? hmsSign + s + 'S' : '')
    );
  }

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

  // FORMATTING

  addFormatToken('X', 0, 0, 'unix');
  addFormatToken('x', 0, 0, 'valueOf');

  // PARSING

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

  //! moment.js

  hooks.version = '2.29.1';

  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: 'YYYY-MM-DDTHH:mm', // <input type="datetime-local" />
    DATETIME_LOCAL_SECONDS: 'YYYY-MM-DDTHH:mm:ss', // <input type="datetime-local" step="1" />
    DATETIME_LOCAL_MS: 'YYYY-MM-DDTHH:mm:ss.SSS', // <input type="datetime-local" step="0.001" />
    DATE: 'YYYY-MM-DD', // <input type="date" />
    TIME: 'HH:mm', // <input type="time" />
    TIME_SECONDS: 'HH:mm:ss', // <input type="time" step="1" />
    TIME_MS: 'HH:mm:ss.SSS', // <input type="time" step="0.001" />
    WEEK: 'GGGG-[W]WW', // <input type="week" />
    MONTH: 'YYYY-MM', // <input type="month" />
  };

  return hooks;
});
