TrainSignManage/WebFrame/bower_components/moment/src/lib/units/month.js

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import { get } from '../moment/get-set';
import hasOwnProp from '../utils/has-own-prop';
import { addFormatToken } from '../format/format';
import { addUnitAlias } from './aliases';
import { addUnitPriority } from './priorities';
import { addRegexToken, match1to2, match2, matchWord, regexEscape } from '../parse/regex';
import { addParseToken } from '../parse/token';
import { hooks } from '../utils/hooks';
import { MONTH } from './constants';
import toInt from '../utils/to-int';
import isArray from '../utils/is-array';
import isNumber from '../utils/is-number';
import mod from '../utils/mod';
import indexOf from '../utils/index-of';
import { createUTC } from '../create/utc';
import getParsingFlags from '../create/parsing-flags';
import { isLeapYear } from '../units/year';

export 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);
});