
/**
 * @fileOverview Date parsing and formatting operations without extending the Date built-in object.
 * @author Chris Leonello
 * @version #VERSION#
 * @date #DATE#
 */
 
(function($) {

    /** 
     * @description
     * <p>Object with extended date parsing and formatting capabilities.
     * This library borrows many concepts and ideas from the Date Instance 
     * Methods by Ken Snyder along with some parts of Ken's actual code.</p>
     *
     * <p>jsDate takes a different approach by not extending the built-in 
     * Date Object, improving date parsing, allowing for multiple formatting 
     * syntaxes and multiple and more easily expandable localization.</p>
     * 
     * @author Chris Leonello
     * @date #date#
     * @version #VERSION#
     * @copyright (c) 2010-2015 Chris Leonello
     * jsDate is currently available for use in all personal or commercial projects 
     * under both the MIT and GPL version 2.0 licenses. This means that you can 
     * choose the license that best suits your project and use it accordingly.
     * 
     * <p>Ken's original Date Instance Methods and copyright notice:</p>
     * <pre>
     * Ken Snyder (ken d snyder at gmail dot com)
     * 2008-09-10
     * version 2.0.2 (http://kendsnyder.com/sandbox/date/)     
     * Creative Commons Attribution License 3.0 (http://creativecommons.org/licenses/by/3.0/)
     * </pre>
     * 
     * @class
     * @name jsDate
     * @param  {String | Number | Array | Date&nbsp;Object | Options&nbsp;Object} arguments Optional arguments, either a parsable date/time string,
     * a JavaScript timestamp, an array of numbers of form [year, month, day, hours, minutes, seconds, milliseconds],
     * a Date object, or an options object of form {syntax: "perl", date:some Date} where all options are optional.
     */
     
    var jsDate = function () {
    
        this.syntax = jsDate.config.syntax;
        this._type = "jsDate";
        this.proxy = new Date();
        this.options = {};
        this.locale = jsDate.regional.getLocale();
        this.formatString = '';
        this.defaultCentury = jsDate.config.defaultCentury;

        switch ( arguments.length ) {
            case 0:
                break;
            case 1:
                // other objects either won't have a _type property or,
                // if they do, it shouldn't be set to "jsDate", so
                // assume it is an options argument.
                if (get_type(arguments[0]) == "[object Object]" && arguments[0]._type != "jsDate") {
                    var opts = this.options = arguments[0];
                    this.syntax = opts.syntax || this.syntax;
                    this.defaultCentury = opts.defaultCentury || this.defaultCentury;
                    this.proxy = jsDate.createDate(opts.date);
                }
                else {
                    this.proxy = jsDate.createDate(arguments[0]);
                }
                break;
            default:
                var a = [];
                for ( var i=0; i<arguments.length; i++ ) {
                    a.push(arguments[i]);
                }
                // this should be the current date/time?
                this.proxy = new Date();
                this.proxy.setFullYear.apply( this.proxy, a.slice(0,3) );
                if ( a.slice(3).length ) {
                    this.proxy.setHours.apply( this.proxy, a.slice(3) );
                }
                break;
        }
    };
    
    /**
     * @namespace Configuration options that will be used as defaults for all instances on the page.
     * @property {String} defaultLocale The default locale to use [en].
     * @property {String} syntax The default syntax to use [perl].
     * @property {Number} defaultCentury The default centry for 2 digit dates.
     */
    jsDate.config = {
        defaultLocale: 'en',
        syntax: 'perl',
        defaultCentury: 1900
    };
        
    /**
     * Add an arbitrary amount to the currently stored date
     * 
     * @param {Number} number      
     * @param {String} unit
     * @returns {jsDate}       
     */
     
    jsDate.prototype.add = function(number, unit) {
        var factor = multipliers[unit] || multipliers.day;
        if (typeof factor == 'number') {
            this.proxy.setTime(this.proxy.getTime() + (factor * number));
        } else {
            factor.add(this, number);
        }
        return this;
    };
        
    /**
     * Create a new jqplot.date object with the same date
     * 
     * @returns {jsDate}
     */  
     
    jsDate.prototype.clone = function() {
            return new jsDate(this.proxy.getTime());
    };

    /**
     * Get the UTC TimeZone Offset of this date in milliseconds.
     *
     * @returns {Number}
     */

    jsDate.prototype.getUtcOffset = function() {
        return this.proxy.getTimezoneOffset() * 60000;
    };

    /**
     * Find the difference between this jsDate and another date.
     * 
     * @param {String| Number| Array| jsDate&nbsp;Object| Date&nbsp;Object} dateObj
     * @param {String} unit
     * @param {Boolean} allowDecimal
     * @returns {Number} Number of units difference between dates.
     */
     
    jsDate.prototype.diff = function(dateObj, unit, allowDecimal) {
        // ensure we have a Date object
        dateObj = new jsDate(dateObj);
        if (dateObj === null) {
            return null;
        }
        // get the multiplying factor integer or factor function
        var factor = multipliers[unit] || multipliers.day;
        if (typeof factor == 'number') {
            // multiply
            var unitDiff = (this.proxy.getTime() - dateObj.proxy.getTime()) / factor;
        } else {
            // run function
            var unitDiff = factor.diff(this.proxy, dateObj.proxy);
        }
        // if decimals are not allowed, round toward zero
        return (allowDecimal ? unitDiff : Math[unitDiff > 0 ? 'floor' : 'ceil'](unitDiff));          
    };
    
    /**
     * Get the abbreviated name of the current week day
     * 
     * @returns {String}
     */   
     
    jsDate.prototype.getAbbrDayName = function() {
        return jsDate.regional[this.locale]["dayNamesShort"][this.proxy.getDay()];
    };
    
    /**
     * Get the abbreviated name of the current month
     * 
     * @returns {String}
     */
     
    jsDate.prototype.getAbbrMonthName = function() {
        return jsDate.regional[this.locale]["monthNamesShort"][this.proxy.getMonth()];
    };
    
    /**
     * Get UPPER CASE AM or PM for the current time
     * 
     * @returns {String}
     */
     
    jsDate.prototype.getAMPM = function() {
        return this.proxy.getHours() >= 12 ? 'PM' : 'AM';
    };
    
    /**
     * Get lower case am or pm for the current time
     * 
     * @returns {String}
     */
     
    jsDate.prototype.getAmPm = function() {
        return this.proxy.getHours() >= 12 ? 'pm' : 'am';
    };
    
    /**
     * Get the century (19 for 20th Century)
     *
     * @returns {Integer} Century (19 for 20th century).
     */
    jsDate.prototype.getCentury = function() { 
        return parseInt(this.proxy.getFullYear()/100, 10);
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getDate = function() {
        return this.proxy.getDate();
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getDay = function() {
        return this.proxy.getDay();
    };
    
    /**
     * Get the Day of week 1 (Monday) thru 7 (Sunday)
     * 
     * @returns {Integer} Day of week 1 (Monday) thru 7 (Sunday)
     */
    jsDate.prototype.getDayOfWeek = function() { 
        var dow = this.proxy.getDay(); 
        return dow===0?7:dow; 
    };
    
    /**
     * Get the day of the year
     * 
     * @returns {Integer} 1 - 366, day of the year
     */
    jsDate.prototype.getDayOfYear = function() {
        var d = this.proxy;
        var ms = d - new Date('' + d.getFullYear() + '/1/1 GMT');
        ms += d.getTimezoneOffset()*60000;
        d = null;
        return parseInt(ms/60000/60/24, 10)+1;
    };
    
    /**
     * Get the name of the current week day
     * 
     * @returns {String}
     */  
     
    jsDate.prototype.getDayName = function() {
        return jsDate.regional[this.locale]["dayNames"][this.proxy.getDay()];
    };
    
    /**
     * Get the week number of the given year, starting with the first Sunday as the first week
     * @returns {Integer} Week number (13 for the 13th full week of the year).
     */
    jsDate.prototype.getFullWeekOfYear = function() {
        var d = this.proxy;
        var doy = this.getDayOfYear();
        var rdow = 6-d.getDay();
        var woy = parseInt((doy+rdow)/7, 10);
        return woy;
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getFullYear = function() {
        return this.proxy.getFullYear();
    };
    
    /**
     * Get the GMT offset in hours and minutes (e.g. +06:30)
     * 
     * @returns {String}
     */
     
    jsDate.prototype.getGmtOffset = function() {
        // divide the minutes offset by 60
        var hours = this.proxy.getTimezoneOffset() / 60;
        // decide if we are ahead of or behind GMT
        var prefix = hours < 0 ? '+' : '-';
        // remove the negative sign if any
        hours = Math.abs(hours);
        // add the +/- to the padded number of hours to : to the padded minutes
        return prefix + addZeros(Math.floor(hours), 2) + ':' + addZeros((hours % 1) * 60, 2);
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getHours = function() {
        return this.proxy.getHours();
    };
    
    /**
     * Get the current hour on a 12-hour scheme
     * 
     * @returns {Integer}
     */
     
    jsDate.prototype.getHours12  = function() {
        var hours = this.proxy.getHours();
        return hours > 12 ? hours - 12 : (hours == 0 ? 12 : hours);
    };
    
    
    jsDate.prototype.getIsoWeek = function() {
        var d = this.proxy;
        var woy = this.getWeekOfYear();
        var dow1_1 = (new Date('' + d.getFullYear() + '/1/1')).getDay();
        // First week is 01 and not 00 as in the case of %U and %W,
        // so we add 1 to the final result except if day 1 of the year
        // is a Monday (then %W returns 01).
        // We also need to subtract 1 if the day 1 of the year is 
        // Friday-Sunday, so the resulting equation becomes:
        var idow = woy + (dow1_1 > 4 || dow1_1 <= 1 ? 0 : 1);
        if(idow == 53 && (new Date('' + d.getFullYear() + '/12/31')).getDay() < 4)
        {
            idow = 1;
        }
        else if(idow === 0)
        {
            d = new jsDate(new Date('' + (d.getFullYear()-1) + '/12/31'));
            idow = d.getIsoWeek();
        }
        d = null;
        return idow;
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getMilliseconds = function() {
        return this.proxy.getMilliseconds();
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getMinutes = function() {
        return this.proxy.getMinutes();
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getMonth = function() {
        return this.proxy.getMonth();
    };
    
    /**
     * Get the name of the current month
     * 
     * @returns {String}
     */
     
    jsDate.prototype.getMonthName = function() {
        return jsDate.regional[this.locale]["monthNames"][this.proxy.getMonth()];
    };
    
    /**
     * Get the number of the current month, 1-12
     * 
     * @returns {Integer}
     */
     
    jsDate.prototype.getMonthNumber = function() {
        return this.proxy.getMonth() + 1;
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getSeconds = function() {
        return this.proxy.getSeconds();
    };
    
    /**
     * Return a proper two-digit year integer
     * 
     * @returns {Integer}
     */
     
    jsDate.prototype.getShortYear = function() {
        return this.proxy.getYear() % 100;
    };
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getTime = function() {
        return this.proxy.getTime();
    };
    
    /**
     * Get the timezone abbreviation
     *
     * @returns {String} Abbreviation for the timezone
     */
    jsDate.prototype.getTimezoneAbbr = function() {
        return this.proxy.toString().replace(/^.*\(([^)]+)\)$/, '$1'); 
    };
    
    /**
     * Get the browser-reported name for the current timezone (e.g. MDT, Mountain Daylight Time)
     * 
     * @returns {String}
     */
    jsDate.prototype.getTimezoneName = function() {
        var match = /(?:\((.+)\)$| ([A-Z]{3}) )/.exec(this.toString());
        return match[1] || match[2] || 'GMT' + this.getGmtOffset();
    }; 
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getTimezoneOffset = function() {
        return this.proxy.getTimezoneOffset();
    };
    
    
    /**
     * Get the week number of the given year, starting with the first Monday as the first week
     * @returns {Integer} Week number (13 for the 13th week of the year).
     */
    jsDate.prototype.getWeekOfYear = function() {
        var doy = this.getDayOfYear();
        var rdow = 7 - this.getDayOfWeek();
        var woy = parseInt((doy+rdow)/7, 10);
        return woy;
    };
    
    /**
     * Get the current date as a Unix timestamp
     * 
     * @returns {Integer}
     */
     
    jsDate.prototype.getUnix = function() {
        return Math.round(this.proxy.getTime() / 1000, 0);
    }; 
    
    /**
     * Implements Date functionality
     */
    jsDate.prototype.getYear = function() {
        return this.proxy.getYear();
    };
    
    /**
     * Return a date one day ahead (or any other unit)
     * 
     * @param {String} unit Optional, year | month | day | week | hour | minute | second | millisecond
     * @returns {jsDate}
     */
     
    jsDate.prototype.next = function(unit) {
        unit = unit || 'day';
        return this.clone().add(1, unit);
    };
    
    /**
     * Set the jsDate instance to a new date.
     *
     * @param  {String | Number | Array | Date Object | jsDate Object | Options Object} arguments Optional arguments, 
     * either a parsable date/time string,
     * a JavaScript timestamp, an array of numbers of form [year, month, day, hours, minutes, seconds, milliseconds],
     * a Date object, jsDate Object or an options object of form {syntax: "perl", date:some Date} where all options are optional.
     */
    jsDate.prototype.set = function() {
        switch ( arguments.length ) {
            case 0:
                this.proxy = new Date();
                break;
            case 1:
                // other objects either won't have a _type property or,
                // if they do, it shouldn't be set to "jsDate", so
                // assume it is an options argument.
                if (get_type(arguments[0]) == "[object Object]" && arguments[0]._type != "jsDate") {
                    var opts = this.options = arguments[0];
                    this.syntax = opts.syntax || this.syntax;
                    this.defaultCentury = opts.defaultCentury || this.defaultCentury;
                    this.proxy = jsDate.createDate(opts.date);
                }
                else {
                    this.proxy = jsDate.createDate(arguments[0]);
                }
                break;
            default:
                var a = [];
                for ( var i=0; i<arguments.length; i++ ) {
                    a.push(arguments[i]);
                }
                // this should be the current date/time
                this.proxy = new Date();
                this.proxy.setFullYear.apply( this.proxy, a.slice(0,3) );
                if ( a.slice(3).length ) {
                    this.proxy.setHours.apply( this.proxy, a.slice(3) );
                }
                break;
        }
        return this;
    };
    
    /**
     * Sets the day of the month for a specified date according to local time.
     * @param {Integer} dayValue An integer from 1 to 31, representing the day of the month. 
     */
    jsDate.prototype.setDate = function(n) {
        this.proxy.setDate(n);
        return this;
    };
    
    /**
     * Sets the full year for a specified date according to local time.
     * @param {Integer} yearValue The numeric value of the year, for example, 1995.  
     * @param {Integer} monthValue Optional, between 0 and 11 representing the months January through December.  
     * @param {Integer} dayValue Optional, between 1 and 31 representing the day of the month. If you specify the dayValue parameter, you must also specify the monthValue. 
     */
    jsDate.prototype.setFullYear = function() {
        this.proxy.setFullYear.apply(this.proxy, arguments);
        return this;
    };
    
    /**
     * Sets the hours for a specified date according to local time.
     * 
     * @param {Integer} hoursValue An integer between 0 and 23, representing the hour.  
     * @param {Integer} minutesValue Optional, An integer between 0 and 59, representing the minutes.  
     * @param {Integer} secondsValue Optional, An integer between 0 and 59, representing the seconds. 
     * If you specify the secondsValue parameter, you must also specify the minutesValue.  
     * @param {Integer} msValue Optional, A number between 0 and 999, representing the milliseconds. 
     * If you specify the msValue parameter, you must also specify the minutesValue and secondsValue. 
     */
    jsDate.prototype.setHours = function() {
        this.proxy.setHours.apply(this.proxy, arguments);
        return this;
    };
    
    /**
     * Implements Date functionality
     */ 
    jsDate.prototype.setMilliseconds = function(n) {
        this.proxy.setMilliseconds(n);
        return this;
    };
    
    /**
     * Implements Date functionality
     */ 
    jsDate.prototype.setMinutes = function() {
        this.proxy.setMinutes.apply(this.proxy, arguments);
        return this;
    };
    
    /**
     * Implements Date functionality
     */ 
    jsDate.prototype.setMonth = function() {
        this.proxy.setMonth.apply(this.proxy, arguments);
        return this;
    };
    
    /**
     * Implements Date functionality
     */ 
    jsDate.prototype.setSeconds = function() {
        this.proxy.setSeconds.apply(this.proxy, arguments);
        return this;
    };
    
    /**
     * Implements Date functionality
     */ 
    jsDate.prototype.setTime = function(n) {
        this.proxy.setTime(n);
        return this;
    };
    
    /**
     * Implements Date functionality
     */ 
    jsDate.prototype.setYear = function() {
        this.proxy.setYear.apply(this.proxy, arguments);
        return this;
    };
    
    /**
     * Provide a formatted string representation of this date.
     * 
     * @param {String} formatString A format string.  
     * See: {@link jsDate.formats}.
     * @returns {String} Date String.
     */
            
    jsDate.prototype.strftime = function(formatString) {
        formatString = formatString || this.formatString || jsDate.regional[this.locale]['formatString'];
        return jsDate.strftime(this, formatString, this.syntax);
    };
        
    /**
     * Return a String representation of this jsDate object.
     * @returns {String} Date string.
     */
    
    jsDate.prototype.toString = function() {
        return this.proxy.toString();
    };
        
    /**
     * Convert the current date to an 8-digit integer (%Y%m%d)
     * 
     * @returns {Integer}
     */
     
    jsDate.prototype.toYmdInt = function() {
        return (this.proxy.getFullYear() * 10000) + (this.getMonthNumber() * 100) + this.proxy.getDate();
    };
    
    /**
     * @namespace Holds localizations for month/day names.
     * <p>jsDate attempts to detect locale when loaded and defaults to 'en'.
     * If a localization is detected which is not available, jsDate defaults to 'en'.
     * Additional localizations can be added after jsDate loads.  After adding a localization,
     * call the jsDate.regional.getLocale() method.  Currently, en, fr and de are defined.</p>
     * 
     * <p>Localizations must be an object and have the following properties defined:  monthNames, monthNamesShort, dayNames, dayNamesShort and Localizations are added like:</p>
     * <pre class="code">
     * jsDate.regional['en'] = {
     * monthNames      : 'January February March April May June July August September October November December'.split(' '),
     * monthNamesShort : 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec'.split(' '),
     * dayNames        : 'Sunday Monday Tuesday Wednesday Thursday Friday Saturday'.split(' '),
     * dayNamesShort   : 'Sun Mon Tue Wed Thu Fri Sat'.split(' ')
     * };
     * </pre>
     * <p>After adding localizations, call <code>jsDate.regional.getLocale();</code> to update the locale setting with the
     * new localizations.</p>
     */
     
    jsDate.regional = {
        'en': {
            monthNames: ['January','February','March','April','May','June','July','August','September','October','November','December'],
            monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun','Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
            dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
            dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },
        
        'fr': {
            monthNames: ['Janvier','Février','Mars','Avril','Mai','Juin','Juillet','Août','Septembre','Octobre','Novembre','Décembre'],
            monthNamesShort: ['Jan','Fév','Mar','Avr','Mai','Jun','Jul','Aoû','Sep','Oct','Nov','Déc'],
            dayNames: ['Dimanche','Lundi','Mardi','Mercredi','Jeudi','Vendredi','Samedi'],
            dayNamesShort: ['Dim','Lun','Mar','Mer','Jeu','Ven','Sam'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },
        
        'de': {
            monthNames: ['Januar','Februar','März','April','Mai','Juni','Juli','August','September','Oktober','November','Dezember'],
            monthNamesShort: ['Jan','Feb','Mär','Apr','Mai','Jun','Jul','Aug','Sep','Okt','Nov','Dez'],
            dayNames: ['Sonntag','Montag','Dienstag','Mittwoch','Donnerstag','Freitag','Samstag'],
            dayNamesShort: ['So','Mo','Di','Mi','Do','Fr','Sa'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },
        
        'es': {
            monthNames: ['Enero','Febrero','Marzo','Abril','Mayo','Junio', 'Julio','Agosto','Septiembre','Octubre','Noviembre','Diciembre'],
            monthNamesShort: ['Ene','Feb','Mar','Abr','May','Jun', 'Jul','Ago','Sep','Oct','Nov','Dic'],
            dayNames: ['Domingo','Lunes','Martes','Mi&eacute;rcoles','Jueves','Viernes','S&aacute;bado'],
            dayNamesShort: ['Dom','Lun','Mar','Mi&eacute;','Juv','Vie','S&aacute;b'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },
        
        'ru': {
            monthNames: ['Январь','Февраль','Март','Апрель','Май','Июнь','Июль','Август','Сентябрь','Октябрь','Ноябрь','Декабрь'],
            monthNamesShort: ['Янв','Фев','Мар','Апр','Май','Июн','Июл','Авг','Сен','Окт','Ноя','Дек'],
            dayNames: ['воскресенье','понедельник','вторник','среда','четверг','пятница','суббота'],
            dayNamesShort: ['вск','пнд','втр','срд','чтв','птн','сбт'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },
        
        'ar': {
            monthNames: ['كانون الثاني', 'شباط', 'آذار', 'نيسان', 'آذار', 'حزيران','تموز', 'آب', 'أيلول',   'تشرين الأول', 'تشرين الثاني', 'كانون الأول'],
            monthNamesShort: ['1','2','3','4','5','6','7','8','9','10','11','12'],
            dayNames: ['السبت', 'الأحد', 'الاثنين', 'الثلاثاء', 'الأربعاء', 'الخميس', 'الجمعة'],
            dayNamesShort: ['سبت', 'أحد', 'اثنين', 'ثلاثاء', 'أربعاء', 'خميس', 'جمعة'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },
        
        'pt': {
            monthNames: ['Janeiro','Fevereiro','Mar&ccedil;o','Abril','Maio','Junho','Julho','Agosto','Setembro','Outubro','Novembro','Dezembro'],
            monthNamesShort: ['Jan','Fev','Mar','Abr','Mai','Jun','Jul','Ago','Set','Out','Nov','Dez'],
            dayNames: ['Domingo','Segunda-feira','Ter&ccedil;a-feira','Quarta-feira','Quinta-feira','Sexta-feira','S&aacute;bado'],
            dayNamesShort: ['Dom','Seg','Ter','Qua','Qui','Sex','S&aacute;b'],
            formatString: '%Y-%m-%d %H:%M:%S'   
        },
        
        'pt-BR': {
            monthNames: ['Janeiro','Fevereiro','Mar&ccedil;o','Abril','Maio','Junho', 'Julho','Agosto','Setembro','Outubro','Novembro','Dezembro'],
            monthNamesShort: ['Jan','Fev','Mar','Abr','Mai','Jun','Jul','Ago','Set','Out','Nov','Dez'],
            dayNames: ['Domingo','Segunda-feira','Ter&ccedil;a-feira','Quarta-feira','Quinta-feira','Sexta-feira','S&aacute;bado'],
            dayNamesShort: ['Dom','Seg','Ter','Qua','Qui','Sex','S&aacute;b'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },
        
        'pl': {
            monthNames: ['Styczeń','Luty','Marzec','Kwiecień','Maj','Czerwiec','Lipiec','Sierpień','Wrzesień','Październik','Listopad','Grudzień'],
            monthNamesShort: ['Sty', 'Lut', 'Mar', 'Kwi', 'Maj', 'Cze','Lip', 'Sie', 'Wrz', 'Paź', 'Lis', 'Gru'],
            dayNames: ['Niedziela', 'Poniedziałek', 'Wtorek', 'Środa', 'Czwartek', 'Piątek', 'Sobota'],
            dayNamesShort: ['Ni', 'Pn', 'Wt', 'Śr', 'Cz', 'Pt', 'Sb'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },

        'nl': {
            monthNames: ['Januari','Februari','Maart','April','Mei','Juni','July','Augustus','September','Oktober','November','December'],
            monthNamesShort: ['Jan','Feb','Mar','Apr','Mei','Jun','Jul','Aug','Sep','Okt','Nov','Dec'],
            dayNames:','['Zondag','Maandag','Dinsdag','Woensdag','Donderdag','Vrijdag','Zaterdag'],
            dayNamesShort: ['Zo','Ma','Di','Wo','Do','Vr','Za'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },

        'sv': {
            monthNames: ['januari','februari','mars','april','maj','juni','juli','augusti','september','oktober','november','december'],
            monthNamesShort: ['jan','feb','mar','apr','maj','jun','jul','aug','sep','okt','nov','dec'],
            dayNames: ['söndag','måndag','tisdag','onsdag','torsdag','fredag','lördag'],
            dayNamesShort: ['sön','mån','tis','ons','tor','fre','lör'],
            formatString: '%Y-%m-%d %H:%M:%S'
        },

        'it': {
            monthNames: ['Gennaio','Febbraio','Marzo','Aprile','Maggio','Giugno','Luglio','Agosto','Settembre','Ottobre','Novembre','Dicembre'],
            monthNamesShort: ['Gen','Feb','Mar','Apr','Mag','Giu','Lug','Ago','Set','Ott','Nov','Dic'],
            dayNames: ['Domenica','Lunedi','Martedi','Mercoledi','Giovedi','Venerdi','Sabato'],
            dayNamesShort: ['Dom','Lun','Mar','Mer','Gio','Ven','Sab'],
            formatString: '%d-%m-%Y %H:%M:%S'
        }
    
    };
    
    // Set english variants to 'en'
    jsDate.regional['en-US'] = jsDate.regional['en-GB'] = jsDate.regional['en'];
    
    /**
     * Try to determine the users locale based on the lang attribute of the html page.  Defaults to 'en'
     * if it cannot figure out a locale of if the locale does not have a localization defined.
     * @returns {String} locale
     */
     
    jsDate.regional.getLocale = function () {
        var l = jsDate.config.defaultLocale;
        
        if ( document && document.getElementsByTagName('html') && document.getElementsByTagName('html')[0].lang ) {
            l = document.getElementsByTagName('html')[0].lang;
            if (!jsDate.regional.hasOwnProperty(l)) {
                l = jsDate.config.defaultLocale;
            }
        }
        
        return l;
    };
    
    // ms in day
    var day = 24 * 60 * 60 * 1000;
    
    // padd a number with zeros
    var addZeros = function(num, digits) {
        num = String(num);
        var i = digits - num.length;
        var s = String(Math.pow(10, i)).slice(1);
        return s.concat(num);
    };

    // representations used for calculating differences between dates.
    // This borrows heavily from Ken Snyder's work.
    var multipliers = {
        millisecond: 1,
        second: 1000,
        minute: 60 * 1000,
        hour: 60 * 60 * 1000,
        day: day,
        week: 7 * day,
        month: {
            // add a number of months
            add: function(d, number) {
                // add any years needed (increments of 12)
                multipliers.year.add(d, Math[number > 0 ? 'floor' : 'ceil'](number / 12));
                // ensure that we properly wrap betwen December and January
                // 11 % 12 = 11
                // 12 % 12 = 0
                var prevMonth = d.getMonth() + (number % 12);
                if (prevMonth == 12) {
                    prevMonth = 0;
                    d.setYear(d.getFullYear() + 1);
                } else if (prevMonth == -1) {
                    prevMonth = 11;
                    d.setYear(d.getFullYear() - 1);
                }
                d.setMonth(prevMonth);
            },
            // get the number of months between two Date objects (decimal to the nearest day)
            diff: function(d1, d2) {
                // get the number of years
                var diffYears = d1.getFullYear() - d2.getFullYear();
                // get the number of remaining months
                var diffMonths = d1.getMonth() - d2.getMonth() + (diffYears * 12);
                // get the number of remaining days
                var diffDays = d1.getDate() - d2.getDate();
                // return the month difference with the days difference as a decimal
                return diffMonths + (diffDays / 30);
            }
        },
        year: {
            // add a number of years
            add: function(d, number) {
                d.setYear(d.getFullYear() + Math[number > 0 ? 'floor' : 'ceil'](number));
            },
            // get the number of years between two Date objects (decimal to the nearest day)
            diff: function(d1, d2) {
                return multipliers.month.diff(d1, d2) / 12;
            }
        }        
    };
    //
    // Alias each multiplier with an 's' to allow 'year' and 'years' for example.
    // This comes from Ken Snyders work.
    //
    for (var unit in multipliers) {
        if (unit.substring(unit.length - 1) != 's') { // IE will iterate newly added properties :|
            multipliers[unit + 's'] = multipliers[unit];
        }
    }
    
    //
    // take a jsDate instance and a format code and return the formatted value.
    // This is a somewhat modified version of Ken Snyder's method.
    //
    var format = function(d, code, syntax) {
        // if shorcut codes are used, recursively expand those.
        if (jsDate.formats[syntax]["shortcuts"][code]) {
            return jsDate.strftime(d, jsDate.formats[syntax]["shortcuts"][code], syntax);
        } else {
            // get the format code function and addZeros() argument
            var getter = (jsDate.formats[syntax]["codes"][code] || '').split('.');
            var nbr = d['get' + getter[0]] ? d['get' + getter[0]]() : '';
            if (getter[1]) {
                nbr = addZeros(nbr, getter[1]);
            }
            return nbr;
        }       
    };
    
    /**
     * @static
     * Static function for convert a date to a string according to a given format.  Also acts as namespace for strftime format codes.
     * <p>strftime formatting can be accomplished without creating a jsDate object by calling jsDate.strftime():</p>
     * <pre class="code">
     * var formattedDate = jsDate.strftime('Feb 8, 2006 8:48:32', '%Y-%m-%d %H:%M:%S');
     * </pre>
     * @param {String | Number | Array | jsDate&nbsp;Object | Date&nbsp;Object} date A parsable date string, JavaScript time stamp, Array of form [year, month, day, hours, minutes, seconds, milliseconds], jsDate Object or Date object.
     * @param {String} formatString String with embedded date formatting codes.  
     * See: {@link jsDate.formats}. 
     * @param {String} syntax Optional syntax to use [default perl].
     * @param {String} locale Optional locale to use.
     * @returns {String} Formatted representation of the date.
    */
    //
    // Logic as implemented here is very similar to Ken Snyder's Date Instance Methods.
    //
    jsDate.strftime = function(d, formatString, syntax, locale) {
        var syn = 'perl';
        var loc = jsDate.regional.getLocale();
        
        // check if syntax and locale are available or reversed
        if (syntax && jsDate.formats.hasOwnProperty(syntax)) {
            syn = syntax;
        }
        else if (syntax && jsDate.regional.hasOwnProperty(syntax)) {
            loc = syntax;
        }
        
        if (locale && jsDate.formats.hasOwnProperty(locale)) {
            syn = locale;
        }
        else if (locale && jsDate.regional.hasOwnProperty(locale)) {
            loc = locale;
        }
        
        if (get_type(d) != "[object Object]" || d._type != "jsDate") {
            d = new jsDate(d);
            d.locale = loc;
        }
        if (!formatString) {
            formatString = d.formatString || jsDate.regional[loc]['formatString'];
        }
        // default the format string to year-month-day
        var source = formatString || '%Y-%m-%d', 
            result = '', 
            match;
        // replace each format code
        while (source.length > 0) {
            if (match = source.match(jsDate.formats[syn].codes.matcher)) {
                result += source.slice(0, match.index);
                result += (match[1] || '') + format(d, match[2], syn);
                source = source.slice(match.index + match[0].length);
            } else {
                result += source;
                source = '';
            }
        }
        return result;
    };
    
    /**
     * @namespace
     * Namespace to hold format codes and format shortcuts.  "perl" and "php" format codes 
     * and shortcuts are defined by default.  Additional codes and shortcuts can be
     * added like:
     * 
     * <pre class="code">
     * jsDate.formats["perl"] = {
     *     "codes": {
     *         matcher: /someregex/,
     *         Y: "fullYear",  // name of "get" method without the "get",
     *         ...,            // more codes
     *     },
     *     "shortcuts": {
     *         F: '%Y-%m-%d',
     *         ...,            // more shortcuts
     *     }
     * };
     * </pre>
     * 
     * <p>Additionally, ISO and SQL shortcuts are defined and can be accesses via:
     * <code>jsDate.formats.ISO</code> and <code>jsDate.formats.SQL</code>
     */
    
    jsDate.formats = {
        ISO:'%Y-%m-%dT%H:%M:%S.%N%G',
        SQL:'%Y-%m-%d %H:%M:%S'
    };
    
    /**
     * Perl format codes and shortcuts for strftime.
     * 
     * A hash (object) of codes where each code must be an array where the first member is 
     * the name of a Date.prototype or jsDate.prototype function to call
     * and optionally a second member indicating the number to pass to addZeros()
     * 
     * <p>The following format codes are defined:</p>
     * 
     * <pre class="code">
     * Code    Result                    Description
     * == Years ==           
     * %Y      2008                      Four-digit year
     * %y      08                        Two-digit year
     * 
     * == Months ==          
     * %m      09                        Two-digit month
     * %#m     9                         One or two-digit month
     * %B      September                 Full month name
     * %b      Sep                       Abbreviated month name
     * 
     * == Days ==            
     * %d      05                        Two-digit day of month
     * %#d     5                         One or two-digit day of month
     * %e      5                         One or two-digit day of month
     * %A      Sunday                    Full name of the day of the week
     * %a      Sun                       Abbreviated name of the day of the week
     * %w      0                         Number of the day of the week (0 = Sunday, 6 = Saturday)
     * 
     * == Hours ==           
     * %H      23                        Hours in 24-hour format (two digits)
     * %#H     3                         Hours in 24-hour integer format (one or two digits)
     * %I      11                        Hours in 12-hour format (two digits)
     * %#I     3                         Hours in 12-hour integer format (one or two digits)
     * %p      PM                        AM or PM
     * 
     * == Minutes ==         
     * %M      09                        Minutes (two digits)
     * %#M     9                         Minutes (one or two digits)
     * 
     * == Seconds ==         
     * %S      02                        Seconds (two digits)
     * %#S     2                         Seconds (one or two digits)
     * %s      1206567625723             Unix timestamp (Seconds past 1970-01-01 00:00:00)
     * 
     * == Milliseconds ==    
     * %N      008                       Milliseconds (three digits)
     * %#N     8                         Milliseconds (one to three digits)
     * 
     * == Timezone ==        
     * %O      360                       difference in minutes between local time and GMT
     * %Z      Mountain Standard Time    Name of timezone as reported by browser
     * %G      06:00                     Hours and minutes between GMT
     * 
     * == Shortcuts ==       
     * %F      2008-03-26                %Y-%m-%d
     * %T      05:06:30                  %H:%M:%S
     * %X      05:06:30                  %H:%M:%S
     * %x      03/26/08                  %m/%d/%y
     * %D      03/26/08                  %m/%d/%y
     * %#c     Wed Mar 26 15:31:00 2008  %a %b %e %H:%M:%S %Y
     * %v      3-Sep-2008                %e-%b-%Y
     * %R      15:31                     %H:%M
     * %r      03:31:00 PM               %I:%M:%S %p
     * 
     * == Characters ==      
     * %n      \n                        Newline
     * %t      \t                        Tab
     * %%      %                         Percent Symbol
     * </pre>
     * 
     * <p>Formatting shortcuts that will be translated into their longer version.
     * Be sure that format shortcuts do not refer to themselves: this will cause an infinite loop.</p>
     * 
     * <p>Format codes and format shortcuts can be redefined after the jsDate
     * module is imported.</p>
     * 
     * <p>Note that if you redefine the whole hash (object), you must supply a "matcher"
     * regex for the parser.  The default matcher is:</p>
     * 
     * <code>/()%(#?(%|[a-z]))/i</code>
     * 
     * <p>which corresponds to the Perl syntax used by default.</p>
     * 
     * <p>By customizing the matcher and format codes, nearly any strftime functionality is possible.</p>
     */
     
    jsDate.formats.perl = {
        codes: {
            //
            // 2-part regex matcher for format codes
            //
            // first match must be the character before the code (to account for escaping)
            // second match must be the format code character(s)
            //
            matcher: /()%(#?(%|[a-z]))/i,
            // year
            Y: 'FullYear',
            y: 'ShortYear.2',
            // month
            m: 'MonthNumber.2',
            '#m': 'MonthNumber',
            B: 'MonthName',
            b: 'AbbrMonthName',
            // day
            d: 'Date.2',
            '#d': 'Date',
            e: 'Date',
            A: 'DayName',
            a: 'AbbrDayName',
            w: 'Day',
            // hours
            H: 'Hours.2',
            '#H': 'Hours',
            I: 'Hours12.2',
            '#I': 'Hours12',
            p: 'AMPM',
            // minutes
            M: 'Minutes.2',
            '#M': 'Minutes',
            // seconds
            S: 'Seconds.2',
            '#S': 'Seconds',
            s: 'Unix',
            // milliseconds
            N: 'Milliseconds.3',
            '#N': 'Milliseconds',
            // timezone
            O: 'TimezoneOffset',
            Z: 'TimezoneName',
            G: 'GmtOffset'  
        },
        
        shortcuts: {
            // date
            F: '%Y-%m-%d',
            // time
            T: '%H:%M:%S',
            X: '%H:%M:%S',
            // local format date
            x: '%m/%d/%y',
            D: '%m/%d/%y',
            // local format extended
            '#c': '%a %b %e %H:%M:%S %Y',
            // local format short
            v: '%e-%b-%Y',
            R: '%H:%M',
            r: '%I:%M:%S %p',
            // tab and newline
            t: '\t',
            n: '\n',
            '%': '%'
        }
    };
    
    /**
     * PHP format codes and shortcuts for strftime.
     * 
     * A hash (object) of codes where each code must be an array where the first member is 
     * the name of a Date.prototype or jsDate.prototype function to call
     * and optionally a second member indicating the number to pass to addZeros()
     * 
     * <p>The following format codes are defined:</p>
     * 
     * <pre class="code">
     * Code    Result                    Description
     * === Days ===        
     * %a      Sun through Sat           An abbreviated textual representation of the day
     * %A      Sunday - Saturday         A full textual representation of the day
     * %d      01 to 31                  Two-digit day of the month (with leading zeros)
     * %e      1 to 31                   Day of the month, with a space preceding single digits.
     * %j      001 to 366                Day of the year, 3 digits with leading zeros
     * %u      1 - 7 (Mon - Sun)         ISO-8601 numeric representation of the day of the week
     * %w      0 - 6 (Sun - Sat)         Numeric representation of the day of the week
     *                                  
     * === Week ===                     
     * %U      13                        Full Week number, starting with the first Sunday as the first week
     * %V      01 through 53             ISO-8601:1988 week number, starting with the first week of the year 
     *                                   with at least 4 weekdays, with Monday being the start of the week
     * %W      46                        A numeric representation of the week of the year, 
     *                                   starting with the first Monday as the first week
     * === Month ===                    
     * %b      Jan through Dec           Abbreviated month name, based on the locale
     * %B      January - December        Full month name, based on the locale
     * %h      Jan through Dec           Abbreviated month name, based on the locale (an alias of %b)
     * %m      01 - 12 (Jan - Dec)       Two digit representation of the month
     * 
     * === Year ===                     
     * %C      19                        Two digit century (year/100, truncated to an integer)
     * %y      09 for 2009               Two digit year
     * %Y      2038                      Four digit year
     * 
     * === Time ===                     
     * %H      00 through 23             Two digit representation of the hour in 24-hour format
     * %I      01 through 12             Two digit representation of the hour in 12-hour format
     * %l      1 through 12              Hour in 12-hour format, with a space preceeding single digits
     * %M      00 through 59             Two digit representation of the minute
     * %p      AM/PM                     UPPER-CASE 'AM' or 'PM' based on the given time
     * %P      am/pm                     lower-case 'am' or 'pm' based on the given time
     * %r      09:34:17 PM               Same as %I:%M:%S %p
     * %R      00:35                     Same as %H:%M
     * %S      00 through 59             Two digit representation of the second
     * %T      21:34:17                  Same as %H:%M:%S
     * %X      03:59:16                  Preferred time representation based on locale, without the date
     * %z      -0500 or EST              Either the time zone offset from UTC or the abbreviation
     * %Z      -0500 or EST              The time zone offset/abbreviation option NOT given by %z
     * 
     * === Time and Date ===            
     * %D      02/05/09                  Same as %m/%d/%y
     * %F      2009-02-05                Same as %Y-%m-%d (commonly used in database datestamps)
     * %s      305815200                 Unix Epoch Time timestamp (same as the time() function)
     * %x      02/05/09                  Preferred date representation, without the time
     * 
     * === Miscellaneous ===            
     * %n        ---                     A newline character (\n)
     * %t        ---                     A Tab character (\t)
     * %%        ---                     A literal percentage character (%)
     * </pre>
     */
 
    jsDate.formats.php = {
        codes: {
            //
            // 2-part regex matcher for format codes
            //
            // first match must be the character before the code (to account for escaping)
            // second match must be the format code character(s)
            //
            matcher: /()%((%|[a-z]))/i,
            // day
            a: 'AbbrDayName',
            A: 'DayName',
            d: 'Date.2',
            e: 'Date',
            j: 'DayOfYear.3',
            u: 'DayOfWeek',
            w: 'Day',
            // week
            U: 'FullWeekOfYear.2',
            V: 'IsoWeek.2',
            W: 'WeekOfYear.2',
            // month
            b: 'AbbrMonthName',
            B: 'MonthName',
            m: 'MonthNumber.2',
            h: 'AbbrMonthName',
            // year
            C: 'Century.2',
            y: 'ShortYear.2',
            Y: 'FullYear',
            // time
            H: 'Hours.2',
            I: 'Hours12.2',
            l: 'Hours12',
            p: 'AMPM',
            P: 'AmPm',
            M: 'Minutes.2',
            S: 'Seconds.2',
            s: 'Unix',
            O: 'TimezoneOffset',
            z: 'GmtOffset',
            Z: 'TimezoneAbbr'
        },
        
        shortcuts: {
            D: '%m/%d/%y',
            F: '%Y-%m-%d',
            T: '%H:%M:%S',
            X: '%H:%M:%S',
            x: '%m/%d/%y',
            R: '%H:%M',
            r: '%I:%M:%S %p',
            t: '\t',
            n: '\n',
            '%': '%'
        }
    };   
    //
    // Conceptually, the logic implemented here is similar to Ken Snyder's Date Instance Methods.
    // I use his idea of a set of parsers which can be regular expressions or functions,
    // iterating through those, and then seeing if Date.parse() will create a date.
    // The parser expressions and functions are a little different and some bugs have been
    // worked out.  Also, a lot of "pre-parsing" is done to fix implementation
    // variations of Date.parse() between browsers.
    //
    jsDate.createDate = function(date) {
        // if passing in multiple arguments, try Date constructor
        if (date == null) {
            return new Date();
        }
        // If the passed value is already a date object, return it
        if (date instanceof Date) {
            return date;
        }
        // if (typeof date == 'number') return new Date(date * 1000);
        // If the passed value is an integer, interpret it as a javascript timestamp
        if (typeof date == 'number') {
            return new Date(date);
        }
        
        // Before passing strings into Date.parse(), have to normalize them for certain conditions.
        // If strings are not formatted staccording to the EcmaScript spec, results from Date parse will be implementation dependent.  
        // 
        // For example: 
        //  * FF and Opera assume 2 digit dates are pre y2k, Chome assumes <50 is pre y2k, 50+ is 21st century.  
        //  * Chrome will correctly parse '1984-1-25' into localtime, FF and Opera will not parse.
        //  * Both FF, Chrome and Opera will parse '1984/1/25' into localtime.
        
        // remove leading and trailing spaces
        var parsable = String(date).replace(/^\s*(.+)\s*$/g, '$1');
        
        // replace dahses (-) with slashes (/) in dates like n[nnn]/n[n]/n[nnn]
        parsable = parsable.replace(/^([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,4})/, "$1/$2/$3");
        
        /////////
        // Need to check for '15-Dec-09' also.
        // FF will not parse, but Chrome will.
        // Chrome will set date to 2009 as well.
        /////////
        
        // first check for 'dd-mmm-yyyy' or 'dd/mmm/yyyy' like '15-Dec-2010'
        parsable = parsable.replace(/^(3[01]|[0-2]?\d)[-\/]([a-z]{3,})[-\/](\d{4})/i, "$1 $2 $3");
        
        // Now check for 'dd-mmm-yy' or 'dd/mmm/yy' and normalize years to default century.
        var match = parsable.match(/^(3[01]|[0-2]?\d)[-\/]([a-z]{3,})[-\/](\d{2})\D*/i);
        if (match && match.length > 3) {
            var m3 = parseFloat(match[3]);
            var ny = jsDate.config.defaultCentury + m3;
            ny = String(ny);
            
            // now replace 2 digit year with 4 digit year
            parsable = parsable.replace(/^(3[01]|[0-2]?\d)[-\/]([a-z]{3,})[-\/](\d{2})\D*/i, match[1] +' '+ match[2] +' '+ ny);
            
        }
        
        // Check for '1/19/70 8:14PM'
        // where starts with mm/dd/yy or yy/mm/dd and have something after
        // Check if 1st postiion is greater than 31, assume it is year.
        // Assme all 2 digit years are 1900's.
        // Finally, change them into US style mm/dd/yyyy representations.
        match = parsable.match(/^([0-9]{1,2})[-\/]([0-9]{1,2})[-\/]([0-9]{1,2})[^0-9]/);
        
        function h1(parsable, match) {
            var m1 = parseFloat(match[1]);
            var m2 = parseFloat(match[2]);
            var m3 = parseFloat(match[3]);
            var cent = jsDate.config.defaultCentury;
            var ny, nd, nm, str;
            
            if (m1 > 31) { // first number is a year
                nd = m3;
                nm = m2;
                ny = cent + m1;
            }
            
            else { // last number is the year
                nd = m2;
                nm = m1;
                ny = cent + m3;
            }
            
            str = nm+'/'+nd+'/'+ny;
            
            // now replace 2 digit year with 4 digit year
            return  parsable.replace(/^([0-9]{1,2})[-\/]([0-9]{1,2})[-\/]([0-9]{1,2})/, str);
        
        }
        
        if (match && match.length > 3) {
            parsable = h1(parsable, match);
        }
        
        // Now check for '1/19/70' with nothing after and do as above
        var match = parsable.match(/^([0-9]{1,2})[-\/]([0-9]{1,2})[-\/]([0-9]{1,2})$/);
        
        if (match && match.length > 3) {
            parsable = h1(parsable, match);
        }
                
        
        var i = 0;
        var length = jsDate.matchers.length;
        var pattern,
            ms,
            current = parsable,
            obj;
        while (i < length) {
            ms = Date.parse(current);
            if (!isNaN(ms)) {
                return new Date(ms);
            }
            pattern = jsDate.matchers[i];
            if (typeof pattern == 'function') {
                obj = pattern.call(jsDate, current);
                if (obj instanceof Date) {
                    return obj;
                }
            } else {
                current = parsable.replace(pattern[0], pattern[1]);
            }
            i++;
        }
        return NaN;
    };
    

    /**
     * @static
     * Handy static utility function to return the number of days in a given month.
     * @param {Integer} year Year
     * @param {Integer} month Month (1-12)
     * @returns {Integer} Number of days in the month.
    */
    //
    // handy utility method Borrowed right from Ken Snyder's Date Instance Mehtods.
    // 
    jsDate.daysInMonth = function(year, month) {
        if (month == 2) {
            return new Date(year, 1, 29).getDate() == 29 ? 29 : 28;
        }
        return [undefined,31,undefined,31,30,31,30,31,31,30,31,30,31][month];
    };


    //
    // An Array of regular expressions or functions that will attempt to match the date string.
    // Functions are called with scope of a jsDate instance.
    //
    jsDate.matchers = [
        // convert dd.mmm.yyyy to mm/dd/yyyy (world date to US date).
        [/(3[01]|[0-2]\d)\s*\.\s*(1[0-2]|0\d)\s*\.\s*([1-9]\d{3})/, '$2/$1/$3'],
        // convert yyyy-mm-dd to mm/dd/yyyy (ISO date to US date).
        [/([1-9]\d{3})\s*-\s*(1[0-2]|0\d)\s*-\s*(3[01]|[0-2]\d)/, '$2/$3/$1'],
        // Handle 12 hour or 24 hour time with milliseconds am/pm and optional date part.
        function(str) { 
            var match = str.match(/^(?:(.+)\s+)?([012]?\d)(?:\s*\:\s*(\d\d))?(?:\s*\:\s*(\d\d(\.\d*)?))?\s*(am|pm)?\s*$/i);
            //                   opt. date      hour       opt. minute     opt. second       opt. msec   opt. am or pm
            if (match) {
                if (match[1]) {
                    var d = this.createDate(match[1]);
                    if (isNaN(d)) {
                        return;
                    }
                } else {
                    var d = new Date();
                    d.setMilliseconds(0);
                }
                var hour = parseFloat(match[2]);
                if (match[6]) {
                    hour = match[6].toLowerCase() == 'am' ? (hour == 12 ? 0 : hour) : (hour == 12 ? 12 : hour + 12);
                }
                d.setHours(hour, parseInt(match[3] || 0, 10), parseInt(match[4] || 0, 10), ((parseFloat(match[5] || 0)) || 0)*1000);
                return d;
            }
            else {
                return str;
            }
        },
        // Handle ISO timestamp with time zone.
        function(str) {
            var match = str.match(/^(?:(.+))[T|\s+]([012]\d)(?:\:(\d\d))(?:\:(\d\d))(?:\.\d+)([\+\-]\d\d\:\d\d)$/i);
            if (match) {
                if (match[1]) {
                    var d = this.createDate(match[1]);
                    if (isNaN(d)) {
                        return;
                    }
                } else {
                    var d = new Date();
                    d.setMilliseconds(0);
                }
                var hour = parseFloat(match[2]);
                d.setHours(hour, parseInt(match[3], 10), parseInt(match[4], 10), parseFloat(match[5])*1000);
                return d;
            }
            else {
                    return str;
            }
        },
        // Try to match ambiguous strings like 12/8/22.
        // Use FF date assumption that 2 digit years are 20th century (i.e. 1900's).
        // This may be redundant with pre processing of date already performed.
        function(str) {
            var match = str.match(/^([0-3]?\d)\s*[-\/.\s]{1}\s*([a-zA-Z]{3,9})\s*[-\/.\s]{1}\s*([0-3]?\d)$/);
            if (match) {
                var d = new Date();
                var cent = jsDate.config.defaultCentury;
                var m1 = parseFloat(match[1]);
                var m3 = parseFloat(match[3]);
                var ny, nd, nm;
                if (m1 > 31) { // first number is a year
                    nd = m3;
                    ny = cent + m1;
                }
                
                else { // last number is the year
                    nd = m1;
                    ny = cent + m3;
                }
                
                var nm = inArray(match[2], jsDate.regional[jsDate.regional.getLocale()]["monthNamesShort"]);
                
                if (nm == -1) {
                    nm = inArray(match[2], jsDate.regional[jsDate.regional.getLocale()]["monthNames"]);
                }
            
                d.setFullYear(ny, nm, nd);
                d.setHours(0,0,0,0);
                return d;
            }
            
            else {
                return str;
            }
        }      
    ];

    //
    // I think John Reisig published this method on his blog, ejohn.
    //
    function inArray( elem, array ) {
        if ( array.indexOf ) {
            return array.indexOf( elem );
        }

        for ( var i = 0, length = array.length; i < length; i++ ) {
            if ( array[ i ] === elem ) {
                return i;
            }
        }

        return -1;
    }
    
    //
    // Thanks to Kangax, Christian Sciberras and Stack Overflow for this method.
    //
    function get_type(thing){
        if(thing===null) return "[object Null]"; // special case
        return Object.prototype.toString.call(thing);
    }
    
    $.jsDate = jsDate;

})(jQuery);