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<h1 class="page-title">Source: date-utils.js</h1>

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            <pre class="prettyprint source linenums"><code>/*

? 2011 by Jerry Sievert

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

(function () {
    /** @class Date */
    // constants
    var monthsAbbr = [
        'Jan',
        'Feb',
        'Mar',
        'Apr',
        'May',
        'Jun',
        'Jul',
        'Aug',
        'Sep',
        'Oct',
        'Nov',
        'Dec'
    ];

var monthsFull = [
        'January',
        'February',
        'March',
        'April',
        'May',
        'June',
        'July',
        'August',
        'September',
        'October',
        'November',
        'December'
    ];

var daysAbbr = [
        'Sun',
        'Mon',
        'Tue',
        'Wed',
        'Thu',
        'Fri',
        'Sat'
    ];

var daysFull = [
        'Sunday',
        'Monday',
        'Tuesday',
        'Wednesday',
        'Thursday',
        'Friday',
        'Saturday'
    ];

var dayNames = {
        'su':         0,
        'sun':        0,
        'sunday':     0,
        'mo':         1,
        'mon':        1,
        'monday':     1,
        'tu':         2,
        'tue':        2,
        'tuesday':    2,
        'we':         3,
        'wed':        3,
        'wednesday':  3,
        'th':         4,
        'thu':        4,
        'thursday':   4,
        'fr':         5,
        'fri':        5,
        'friday':     5,
        'sa':         6,
        'sat':        6,
        'saturday':   6
    };
    var monthsAll = monthsFull.concat(monthsAbbr);
    var daysAll = [
        'su',
        'sun',
        'sunday',
        'mo',
        'mon',
        'monday',
        'tu',
        'tue',
        'tuesday',
        'we',
        'wed',
        'wednesday',
        'th',
        'thu',
        'thursday',
        'fr',
        'fri',
        'friday',
        'sa',
        'sat',
        'saturday'
    ];

var monthNames = {
        'jan':        0,
        'january':    0,
        'feb':        1,
        'february':   1,
        'mar':        2,
        'march':      2,
        'apr':        3,
        'april':      3,
        'may':        4,
        'jun':        5,
        'june':       5,
        'jul':        6,
        'july':       6,
        'aug':        7,
        'august':     7,
        'sep':        8,
        'september':  8,
        'oct':        9,
        'october':    9,
        'nov':        10,
        'november':   10,
        'dec':        11,
        'december':   11
    };

var daysInMonth = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];

// private helper functions
    /** @ignore */
    function pad(str, length) {
        str = String(str);
        while (str.length &lt; length) {
            str = '0' + str;
        }
        return str;
    }

// static class methods
    var origParse = Date.parse;
    // ------------------------------------------------------------------
    // getDateFromFormat( date_string , format_string )
    //
    // This function takes a date string and a format string. It matches
    // If the date string matches the format string, it returns the
    // getTime() of the date. If it does not match, it returns NaN.
    // Original Author: Matt Kruse &lt;matt@mattkruse.com>
    // WWW: http://www.mattkruse.com/
    // Adapted from: http://www.mattkruse.com/javascript/date/source.html
    // ------------------------------------------------------------------

var getDateFromFormat = function (val, format) {
        val = val + "";
        format = format + "";
        var iVal = 0;
        var iFormat = 0;
        var c = "";
        var token = "";
        var token2 = "";
        var x, y;
        var now = new Date();
        var year = now.getYear();
        var month = now.getMonth() + 1;
        var date = 1;
        var hh = 0;
        var mm = 0;
        var ss = 0;
        var ampm = "";

while (iFormat &lt; format.length) {
            // Get next token from format string
            c = format.charAt(iFormat);
            token = "";
            while ((format.charAt(iFormat) === c) &amp;&amp; (iFormat &lt; format.length)) {
                token += format.charAt(iFormat++);
            }
            // Extract contents of value based on format token
            if (token === "yyyy" || token === "yy" || token === "y") {
                if (token === "yyyy") {
                    x = 4;
                    y = 4;
                }
                if (token === "yy") {
                    x = 2;
                    y = 2;
                }
                if (token === "y") {
                    x = 2;
                    y = 4;
                }
                year = getInt(val, iVal, x, y);
                if (year === null) {
                    return NaN;
                }
                iVal += year.length;
                if (year.length === 2) {
                    if (year > 70) {
                        year = 1900 + (year - 0);
                    } else {
                        year = 2000 + (year - 0);
                    }
                }
            } else if (token === "MMM" || token === "NNN") {
                month = 0;
                for (var i = 0; i &lt; monthsAll.length; i++) {
                    var monthName = monthsAll[i];
                    if (val.substring(iVal, iVal + monthName.length).toLowerCase() === monthName.toLowerCase()) {
                        if (token === "MMM" || (token === "NNN" &amp;&amp; i > 11)) {
                            month = i + 1;
                            if (month > 12) {
                                month -= 12;
                            }
                            iVal += monthName.length;
                            break;
                        }
                    }
                }
                if ((month &lt; 1) || (month > 12)) {
                    return NaN;
                }
            } else if (token === "EE" || token === "E") {
                for (var n = 0; n &lt; daysAll.length; n++) {
                    var dayName = daysAll[n];
                    if (val.substring(iVal, iVal + dayName.length).toLowerCase() === dayName.toLowerCase()) {
                        iVal += dayName.length;
                        break;
                    }
                }
            } else if (token === "MM" || token === "M") {
                month = getInt(val, iVal, token.length, 2);
                if (month === null || (month &lt; 1) || (month > 12)) {
                    return NaN;
                }
                iVal += month.length;
            } else if (token === "dd" || token === "d") {
                date = getInt(val, iVal, token.length, 2);
                if (date === null || (date &lt; 1) || (date > 31)) {
                    return NaN;
                }
                iVal += date.length;
            } else if (token === "hh" || token === "h") {
                hh = getInt(val, iVal, token.length, 2);
                if (hh === null || (hh &lt; 1) || (hh > 12)) {
                    return NaN;
                }
                iVal += hh.length;
            } else if (token === "HH" || token === "H") {
                hh = getInt(val, iVal, token.length, 2);
                if (hh === null || (hh &lt; 0) || (hh > 23)) {
                    return NaN;
                }
                iVal += hh.length;
            } else if (token === "KK" || token === "K") {
                hh = getInt(val, iVal, token.length, 2);
                if (hh === null || (hh &lt; 0) || (hh > 11)) {
                    return NaN;
                }
                iVal += hh.length;
            } else if (token === "kk" || token === "k") {
                hh = getInt(val, iVal, token.length, 2);
                if (hh === null || (hh &lt; 1) || (hh > 24)) {
                    return NaN;
                }
                iVal += hh.length;
                hh--;
            } else if (token === "mm" || token === "m") {
                mm = getInt(val, iVal, token.length, 2);
                if (mm === null || (mm &lt; 0) || (mm > 59)) {
                    return NaN;
                }
                iVal += mm.length;
            } else if (token === "ss" || token === "s") {
                ss = getInt(val, iVal, token.length, 2);
                if (ss === null || (ss &lt; 0) || (ss > 59)) {
                    return NaN;
                }
                iVal += ss.length;
            } else if (token === "a") {
                if (val.substring(iVal, iVal + 2).toLowerCase() === "am") {
                    ampm = "AM";
                } else if (val.substring(iVal, iVal + 2).toLowerCase() === "pm") {
                    ampm = "PM";
                } else {
                    return NaN;
                }
                iVal += 2;
            } else {
                if (val.substring(iVal, iVal + token.length) !== token) {
                    return NaN;
                } else {
                    iVal += token.length;
                }
            }
        }
        // If there are any trailing characters left in the value, it doesn't match
        if (iVal !== val.length) {
            return NaN;
        }
        // Is date valid for month?
        if (month === 2) {
            // Check for leap year
            if (((year % 4 === 0) &amp;&amp; (year % 100 !== 0)) || (year % 400 === 0)) { // leap year
                if (date > 29) {
                    return NaN;
                }
            } else {
                if (date > 28) {
                    return NaN;
                }
            }
        }
        if ((month === 4) || (month === 6) || (month === 9) || (month === 11)) {
            if (date > 30) {
                return NaN;
            }
        }
        // Correct hours value
        if (hh &lt; 12 &amp;&amp; ampm === "PM") {
            hh = hh - 0 + 12;
        } else if (hh > 11 &amp;&amp; ampm === "AM") {
            hh -= 12;
        }
        var newdate = new Date(year, month - 1, date, hh, mm, ss);
        return newdate.getTime();
    };

/** @ignore */
    Date.parse = function (date, format) {
        if (format) {
            return getDateFromFormat(date, format);
        }
        var timestamp = origParse(date), minutesOffset = 0, match;
        if (isNaN(timestamp) &amp;&amp; (match = /^(\d{4}|[+\-]\d{6})-(\d{2})-(\d{2})(?:[T ](\d{2}):(\d{2})(?::(\d{2})(?:\.(\d{3,}))?)?(?:(Z)|([+\-])(\d{2})(?::?(\d{2}))?))?/.exec(date))) {
            if (match[8] !== 'Z') {
                minutesOffset = +match[10] * 60 + (+match[11]);

if (match[9] === '+') {
                    minutesOffset = 0 - minutesOffset;
                }
            }

match[7] = match[7] || '000';

timestamp = Date.UTC(+match[1], +match[2] - 1, +match[3], +match[4], +match[5] + minutesOffset, +match[6], +match[7].substr(0, 3));
        }

return timestamp;
    };

function polyfill(name, func) {
        if (Date.prototype[name] === undefined) {
            Date.prototype[name] = func;
        }
    }

/**
        Returns new instance of Date object with the date set to today and
        the time set to midnight
        @static
        @returns {Date} Today's Date
        @function today
        @memberof Date
     */
    Date.today = function () {
        return new Date().clearTime();
    };

/**
        Returns new instance of Date object with the date set to today and
        the time set to midnight in UTC
        @static
        @returns {Date} Today's Date in UTC
        @function UTCtoday
        @memberof Date
     */
    Date.UTCtoday = function () {
        return new Date().clearUTCTime();
    };

/**
        Returns new instance of Date object with the date set to tomorrow and
        the time set to midnight
        @static
        @returns {Date} Tomorrow's Date
        @function tomorrow
        @memberof Date
     */
    Date.tomorrow = function () {
        return Date.today().add({days: 1});
    };

/**
        Returns new instance of Date object with the date set to tomorrow and
        the time set to midnight in UTC
        @static
        @returns {Date} Tomorrow's Date in UTC
        @function UTCtomorrow
        @memberof Date
     */
    Date.UTCtomorrow = function () {
        return Date.UTCtoday().add({days: 1});
    };

/**
        Returns new instance of Date object with the date set to yesterday and
        the time set to midnight
        @static
        @returns {Date} Yesterday's Date
        @function yesterday
        @memberof Date
     */
    Date.yesterday = function () {
        return Date.today().add({days: -1});
    };

/**
        Returns new instance of Date object with the date set to yesterday and
        the time set to midnight in UTC
        @static
        @returns {Date} Yesterday's Date in UTC
        @function UTCyesterday
        @memberof Date
     */
    Date.UTCyesterday = function () {
        return Date.UTCtoday().add({days: -1});
    };

/**
       Returns whether the day is valid
       @static
       @param day {Number} day of the month
       @param year {Number} year
       @param month {Number} month of the year [0-11]
       @returns {Boolean}
       @function validateDay
       @memberof Date
    */
    Date.validateDay = function (day, year, month) {
        var date = new Date(year, month, day);
        return (date.getFullYear() === year &amp;&amp;
            date.getMonth() === month &amp;&amp;
            date.getDate() === day);
    };

/**
       Returns whether the year is valid
       @static
       @param year {Number} year
       @returns {Boolean}
       @function validateYear
       @memberof Date
    */
    Date.validateYear = function (year) {
        return (year >= 0 &amp;&amp; year &lt;= 9999);
    };

/**
       Returns whether the second is valid
       @static
       @param second {Number} second
       @returns {Boolean}
       @function validateSecond
       @memberof Date
    */
    Date.validateSecond = function (second) {
        return (second >= 0 &amp;&amp; second &lt; 60);
    };

/**
       Returns whether the month is valid [0-11]
       @static
       @param month {Number} month
       @returns {Boolean}
       @function validateMonth
       @memberof Date
    */
    Date.validateMonth = function (month) {
        return (month >= 0 &amp;&amp; month &lt; 12);
    };

/**
       Returns whether the minute is valid
       @static
       @param minute {Number} minute
       @returns {Boolean}
       @function validateMinute
       @memberof Date
    */
    Date.validateMinute = function (minute) {
        return (minute >= 0 &amp;&amp; minute &lt; 60);
    };

/**
     Returns whether the millisecond is valid
     @static
     @param millisecond {Number} millisecond
     @returns {Boolean}
     @function validateMillisecond
     @memberof Date
  */
    Date.validateMillisecond = function (milli) {
        return (milli >= 0 &amp;&amp; milli &lt; 1000);
    };

/**
       Returns whether the hour is valid [0-23]
       @static
       @param hour {Number} hour
       @returns {Boolean}
       @function validateHour
       @memberof Date
    */
    Date.validateHour = function (hour) {
        return (hour >= 0 &amp;&amp; hour &lt; 24);
    };

/**
       Compares two dates
       @static
       @param date1 {Date} first date
       @param date2 {Date} second date
       @returns {Number} -1 if date1 is less than date2, 0 if they are equal, 1 if date1 is more than date2
       @function compare
       @memberof Date
    */
    Date.compare = function (date1, date2) {
        if (date1.valueOf() &lt; date2.valueOf()) {
            return -1;
        } else if (date1.valueOf() > date2.valueOf()) {
            return 1;
        }
        return 0;
    };

/**
       Compares two dates to the millisecond
       @static
       @param date1 {Date} first date
       @param date2 {Date} second date
       @returns {Boolean}
       @function equals
       @memberof Date
    */
    Date.equals = function (date1, date2) {
        return date1.valueOf() === date2.valueOf();
    };

/**
       Compares two dates by day
       @static
       @param date1 {Date} first date
       @param date2 {Date} second date
       @returns {Boolean}
       @function equalsDay
       @memberof Date
    */
    Date.equalsDay = function (date1, date2) {
        return date1.toYMD() === date2.toYMD();
    };

/**
       Returns the day number for a day [0-6]
       @static
       @param day {String} day name
       @returns {Number}
       @function getDayNumberFromName
       @memberof Date
    */
    Date.getDayNumberFromName = function (name) {
        return dayNames[name.toLowerCase()];
    };

/**
       Returns the day number for a month [0-11]
       @static
       @param month {String} month name
       @returns {Number}
       @function getMonthNumberFromName
       @memberof Date
    */
    Date.getMonthNumberFromName = function (name) {
        return monthNames[name.toLowerCase()];
    };

/**
       Returns the month name for a month [0-11]
       @static
       @param month {Number} month
       @returns {String}
       @function getMonthNameFromNumber
       @memberof Date
    */
    Date.getMonthNameFromNumber = function (number) {
        return monthsFull[number];
    };

/**
       Returns the month name abbreviated for a month [0-11]
       @static
       @param month {Number} month
       @returns {String}
       @function getMonthAbbrNameFromNumber
       @memberof Date
    */
    Date.getMonthAbbrFromNumber = function (number) {
        return monthsAbbr[number];
    };

/**
       Returns whether or not the year is a leap year
       @static
       @param year {Number} year
       @returns {Boolean}
       @function isLeapYear
       @memberof Date
    */
    Date.isLeapYear = function (year) {
        return (new Date(year, 1, 29).getDate() === 29);
    };

/**
       Returns the number of days in a month
       @static
       @param year {Number} year
       @param month {Number} month
       @returns {String}
       @function getDaysInMonth
       @memberof Date
    */
    Date.getDaysInMonth = function (year, month) {
        if (month === 1) {
            return Date.isLeapYear(year) ? 29 : 28;
        }
        return daysInMonth[month];
    };

polyfill('getMonthAbbr', function () {
        return monthsAbbr[this.getMonth()];
    });

polyfill('getMonthName', function () {
        return monthsFull[this.getMonth()];
    });

polyfill('getLastMonthName', function () {
        var i = this.getMonth();
        i = (i === 0 ? 11 : i - 1);
        return monthsFull[i];
    });

polyfill('getUTCOffset', function () {
        var tz = pad(Math.abs(this.getTimezoneOffset() / 0.6), 4);
        if (this.getTimezoneOffset() > 0) {
            tz = '-' + tz;
        }
        return tz;
    });

polyfill('toCLFString',  function () {
        return pad(this.getDate(), 2) + '/' + this.getMonthAbbr() + '/' +
               this.getFullYear() + ':' + pad(this.getHours(), 2) + ':' +
               pad(this.getMinutes(), 2) + ':' + pad(this.getSeconds(), 2) +
               ' ' + this.getUTCOffset();
    });

polyfill('toYMD', function (separator) {
        separator = typeof separator === 'undefined' ? '-' : separator;
        return this.getFullYear() + separator + pad(this.getMonth() + 1, 2) +
            separator + pad(this.getDate(), 2);
    });

polyfill('toDBString', function () {
        return this.getUTCFullYear() + '-' +  pad(this.getUTCMonth() + 1, 2) +
               '-' + pad(this.getUTCDate(), 2) + ' ' + pad(this.getUTCHours(), 2) +
               ':' + pad(this.getUTCMinutes(), 2) + ':' + pad(this.getUTCSeconds(), 2);
    });

polyfill('clearTime', function () {
        this.setHours(0);
        this.setMinutes(0);
        this.setSeconds(0);
        this.setMilliseconds(0);

return this;
    });

polyfill('clearUTCTime', function () {
        this.setUTCHours(0);
        this.setUTCMinutes(0);
        this.setUTCSeconds(0);
        this.setUTCMilliseconds(0);

return this;
    });

polyfill('add', function (obj) {
        if (obj.milliseconds !== undefined) {
            this.setMilliseconds(this.getMilliseconds() + obj.milliseconds);
        }
        if (obj.seconds !== undefined) {
            this.setSeconds(this.getSeconds() + obj.seconds);
        }
        if (obj.minutes !== undefined) {
            this.setMinutes(this.getMinutes() + obj.minutes);
        }
        if (obj.hours !== undefined) {
            this.setHours(this.getHours() + obj.hours);
        }
        if (obj.days !== undefined) {
            this.setDate(this.getDate() + obj.days);
        }
        if (obj.weeks !== undefined) {
            this.setDate(this.getDate() + (obj.weeks * 7));
        }
        if (obj.months !== undefined) {
            this.setMonth(this.getMonth() + obj.months);
        }
        if (obj.years !== undefined) {
            this.setFullYear(this.getFullYear() + obj.years);
        }
        return this;
    });

polyfill('addMilliseconds', function (milliseconds) {
        return this.add({ milliseconds: milliseconds });
    });

polyfill('addSeconds', function (seconds) {
        return this.add({ seconds: seconds });
    });

polyfill('addMinutes', function (minutes) {
        return this.add({ minutes: minutes });
    });

polyfill('addHours', function (hours) {
        return this.add({ hours: hours });
    });

polyfill('addDays', function (days) {
        return this.add({ days: days });
    });

polyfill('addWeeks', function (weeks) {
        return this.add({ days: (weeks * 7) });
    });

polyfill('addMonths', function (months) {
        return this.add({ months: months });
    });

polyfill('addYears', function (years) {
        return this.add({ years: years });
    });

polyfill('remove', function (obj) {
        if (obj.seconds !== undefined) {
            this.setSeconds(this.getSeconds() - obj.seconds);
        }
        if (obj.minutes !== undefined) {
            this.setMinutes(this.getMinutes() - obj.minutes);
        }
        if (obj.hours !== undefined) {
            this.setHours(this.getHours() - obj.hours);
        }
        if (obj.days !== undefined) {
            this.setDate(this.getDate() - obj.days);
        }
        if (obj.weeks !== undefined) {
            this.setDate(this.getDate() - (obj.weeks * 7));
        }
        if (obj.months !== undefined) {
            this.setMonth(this.getMonth() - obj.months);
        }
        if (obj.years !== undefined) {
            this.setFullYear(this.getFullYear() - obj.years);
        }
        return this;
    });

polyfill('removeMilliseconds', function (milliseconds) {
        throw new Error('Not implemented');
    });

polyfill('removeSeconds', function (seconds) {
        return this.remove({ seconds: seconds });
    });

polyfill('removeMinutes', function (minutes) {
        return this.remove({ minutes: minutes });
    });

polyfill('removeHours', function (hours) {
        return this.remove({ hours: hours });
    });

polyfill('removeDays', function (days) {
        return this.remove({ days: days });
    });

polyfill('removeWeeks', function (weeks) {
        return this.remove({ days: (weeks * 7) });
    });

polyfill('removeMonths', function (months) {
        return this.remove({ months: months });
    });

polyfill('removeYears', function (years) {
        return this.remove({ years: years });
    });

//addWeekdays is based on the Mon-Fri work week schedule
    polyfill('addWeekdays', function (weekdays) {
        var day = this.getDay();
        if (day === 0) { day = 7; }
        var daysOffset = weekdays;
        var weekspan = Math.floor(( weekdays + day - 1 ) / 5.0);
        if (weekdays > 0){
            daysOffset += weekspan * 2;
            if ( day > 5 ) { daysOffset -= day - 5; }
        } else {
            daysOffset += Math.min( weekspan * 2, 0);
            if ( day > 6 ) { daysOffset -= 1; }
        }
        return this.addDays( daysOffset );
    });

polyfill('setTimeToNow', function () {
        var n = new Date();
        this.setMilliseconds(n.getMilliseconds());
        this.setSeconds(n.getSeconds());
        this.setMinutes(n.getMinutes());
        this.setHours(n.getHours());
    });

polyfill('clone', function () {
        return new Date(this.valueOf());
    });

polyfill('between', function (start, end) {
        return (this.valueOf() >= start.valueOf() &amp;&amp;
                this.valueOf() &lt;= end.valueOf());
    });

polyfill('compareTo', function (date) {
        return Date.compare(this, date);
    });

polyfill('equals', function (date) {
        return Date.equals(this, date);
    });

polyfill('equalsDay', function (date) {
        return Date.equalsDay(this, date);
    });

polyfill('isToday', function () {
        return Date.equalsDay(this, Date.today());
    });

polyfill('isAfter', function (date) {
        date = date ? date : new Date();
        return (this.compareTo(date) > 0);
    });

polyfill('isBefore', function (date) {
        date = date ? date : new Date();
        return (this.compareTo(date) &lt; 0);
    });

//isWeekend is based on the Sat, Sun weekend definition.
    polyfill('isWeekend', function (date) {
        return (this.getDay() % 6 === 0);
    });

polyfill('getDaysBetween', function (date) {
        return ((date.clone().valueOf() - this.valueOf()) / 86400000) | 0;
    });

polyfill('getHoursBetween', function (date) {
        return ((date.clone().valueOf() - this.valueOf()) / 3600000) | 0;
    });

polyfill('getMinutesBetween', function (date) {
        return ((date.clone().valueOf() - this.valueOf()) / 60000) | 0;
    });

polyfill('getSecondsBetween', function (date) {
        return ((date.clone().valueOf() - this.valueOf()) / 1000) | 0;
    });

polyfill('getMillisecondsBetween', function (date) {
        return ((date.clone().valueOf() - this.valueOf())) | 0;
    });

polyfill('getMonthsBetween', function (date) {
		// make a guess at the answer; using 31 means that we'll be close but won't exceed
		var daysDiff, daysInMonth,
			months = Math.ceil( new Date(date - this).getUTCDate() / 31 ) ,
			testDate = new Date( this.getTime() ),
			totalDays = Date.getDaysInMonth;

// find the maximum number of months that's less than or equal to the end date
		testDate.setUTCMonth( testDate.getUTCMonth() + months );
		while ( testDate.getTime() &lt; date.getTime() ) {
            testDate.setUTCMonth( testDate.getUTCMonth() + 1 );
			months++;
		}

if ( testDate.getTime() !== date.getTime() ) {
			// back off 1 month since we exceeded the end date
			testDate.setUTCMonth( testDate.getUTCMonth() - 1 );
			months--;
		}

if ( date.getUTCMonth() === testDate.getUTCMonth() ) {
			daysDiff = new Date( date - testDate ).getUTCDate();
			daysInMonth = totalDays( testDate.getUTCFullYear(), testDate.getUTCMonth() );

return months + ( daysDiff / daysInMonth );
		} else {
			// if two dates are on different months,
			// the calculation must be done for each separate month
			// because their number of days can be different
			daysInMonth = totalDays( testDate.getUTCFullYear(), testDate.getUTCMonth() );
			daysDiff  = daysInMonth - testDate.getUTCDate() + 1;

return months +
					(+( daysDiff / daysInMonth ).toFixed( 5 )) +
					(+( date.getUTCDate() / totalDays( date.getUTCFullYear(), date.getUTCMonth() ) ).toFixed( 5 ));
		}
	});

polyfill('getOrdinalNumber', function () {
        return Math.ceil((this.clone().clearTime() - new Date(this.getFullYear(), 0, 1)) / 86400000) + 1;
    });

polyfill('toFormat', function (format) {
        return toFormat(format, getReplaceMap(this));
    });

polyfill('toUTCFormat', function (format) {
        return toFormat(format, getUTCReplaceMap(this));
    });

polyfill('getWeekNumber', function() {
        var onejan = new Date(this.getFullYear(),0,1);
        return Math.ceil((((this - onejan) / 86400000) + onejan.getDay()+1)/7);
    });

polyfill('getFullWeekNumber', function() {
        var weekNumber = '' + this.getWeekNumber();
        if (weekNumber.length === 1) {
            weekNumber = "0" + weekNumber;
        }

return weekNumber;
    });

for (i in replaceMap) {
            replace(i, replaceMap[i]);
        }

s = '';
        for (i = 0, l = f.length; i &lt; l; i++)
          s += typeof f[i] == 'string' ? f[i] : f[i][0];
        return f.join('');
    };

var getReplaceMap = function(date) {
        var hours = (date.getHours() % 12) ? date.getHours() % 12 : 12;
        return {
            'YYYY': date.getFullYear(),
            'YY': String(date.getFullYear()).slice(-2),
            'MMMM': monthsFull[date.getMonth()],
            'MMM': monthsAbbr[date.getMonth()],
            'MM': pad(date.getMonth() + 1, 2),
            'MI': pad(date.getMinutes(), 2),
            'M': date.getMonth() + 1,
            'DDDD': daysFull[date.getDay()],
            'DDD': daysAbbr[date.getDay()],
            'DD': pad(date.getDate(), 2),
            'D': date.getDate(),
            'HH24': pad(date.getHours(), 2),
            'HH': pad(hours, 2),
            'H': hours,
            'SS': pad(date.getSeconds(), 2),
            'PP': (date.getHours() >= 12) ? 'PM' : 'AM',
            'P': (date.getHours() >= 12) ? 'pm' : 'am',
            'LL': pad(date.getMilliseconds(), 3)
        };
    };

var getUTCReplaceMap = function(date) {
        var hours = (date.getUTCHours() % 12) ? date.getUTCHours() % 12 : 12;
        return {
            'YYYY': date.getUTCFullYear(),
            'YY': String(date.getUTCFullYear()).slice(-2),
            'MMMM': monthsFull[date.getUTCMonth()],
            'MMM': monthsAbbr[date.getUTCMonth()],
            'MM': pad(date.getUTCMonth() + 1, 2),
            'MI': pad(date.getUTCMinutes(), 2),
            'M': date.getUTCMonth() + 1,
            'DDDD': daysFull[date.getUTCDay()],
            'DDD': daysAbbr[date.getUTCDay()],
            'DD': pad(date.getUTCDate(), 2),
            'D': date.getUTCDate(),
            'HH24': pad(date.getUTCHours(), 2),
            'HH': pad(hours, 2),
            'H': hours,
            'SS': pad(date.getUTCSeconds(), 2),
            'PP': (date.getUTCHours() >= 12) ? 'PM' : 'AM',
            'P': (date.getUTCHours() >= 12) ? 'pm' : 'am',
            'LL': pad(date.getUTCMilliseconds(), 3)
        };
    };
}());
</code></pre>
        </article>
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