/* Date formatting v2.0
 * 
 * This work is licensed under a Creative Commons Attribution 3.0 Unported License
 * http://creativecommons.org/licenses/by/3.0/
 *
 * Author: Andy Harrison, http://dragonzreef.com/
 * Date: 16 September 2011
 */
 
Date.prototype.getMonthName = function(){ return (["January","February","March","April","May","June","July","August","September","October","November","December"])[this.getMonth()]; }
Date.prototype.getUTCMonthName = function(){ return (["January","February","March","April","May","June","July","August","September","October","November","December"])[this.getUTCMonth()]; }
Date.prototype.getDayName = function(){ return (["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"])[this.getDay()]; }
Date.prototype.getUTCDayName = function(){ return (["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"])[this.getUTCDay()]; }
 
//if useUTC is true, UTC values will be used instead of local time values
Date.prototype.format = function(formatStr, useUTC)
{
	/*
	Format string variables:
 
	%Y  4-digit year (e.g., 2011)
	%y  2-digit year (e.g., 11)
	%M  2-digit month (01-12)
	%m  month (1-12)
	%B  full month name (January-December)
	%b  abbreviated month name (Jan-Dec)
	%D  2-digit day of month (01-31)
	%d  day of month (1-31)
	%o  ordinal of the day of month (st, nd, rd, th)
	%W  full weekday name (Sunday-Saturday)
	%w  abbreviated weekday name (Sun-Sat)
	%I  hour in 24-hour format (00-23)
	%H  2-digit hour in 12-hour format (01-12)
	%h  hour in 12-hour format (1-12)
	%P  AM/PM
	%p  am/pm
	%q  a/p
	%N  2-digit minute (00-59)
	%n  minute (0-59)
	%S  2-digit second (00-59)
	%s  second (0-59)
	%Z  3-digit milliseconds (000-999)
	%z  milliseconds (0-999)
	%e  UTC offset +/-
	%F  2-digit hour offset (00-23)
	%f  hour offset (0-23)
	%G  2-digit minute offset (00-59)
	%g  minute offset (0-59)
 
	%%  percent sign
	*/
 
	function pad(numStr, digits)
	{
		numStr = numStr.toString();
		while(numStr.length < digits) numStr = "0"+numStr;
		return numStr;
	}
 
	var theYear = useUTC ? this.getUTCFullYear() : this.getFullYear();
	var theMonth = useUTC ? this.getUTCMonth() : this.getMonth();
	var theMonthName = useUTC ? this.getUTCMonthName() : this.getMonthName();
	var theDate = useUTC ? this.getUTCDate() : this.getDate();
	var theDayName = useUTC ? this.getUTCDayName() : this.getDayName();
	var theHour = useUTC ? this.getUTCHours() : this.getHours();
	var theMinute = useUTC ? this.getUTCMinutes() : this.getMinutes();
	var theSecond = useUTC ? this.getUTCSeconds() : this.getSeconds();
	var theMS = useUTC ? this.getUTCMilliseconds() : this.getMilliseconds();
	var theOffset = useUTC ? 0 : -this.getTimezoneOffset();	//offset in minutes
 
	var v = /%(.)/, m, formatted = "", d, h;
	while((m = v.exec(formatStr)) != null)
	{
		formatted += formatStr.slice(0, m.index);
		switch(m[1])
		{
			case "Y": formatted += theYear; break;
			case "y": formatted += theYear.toString().slice(-2); break;
			case "M": formatted += pad(theMonth+1, 2); break;
			case "m": formatted += theMonth+1; break;
			case "B": formatted += theMonthName; break;
			case "b": formatted += theMonthName.slice(0,3); break;
			case "D": formatted += pad(theDate, 2); break;
			case "d": formatted += theDate; break;
			case "o":
				d = theDate;
				formatted += (d==1 || d==21 || d==31) ? "st" : (d==2 || d==22) ? "nd" : (d==3 || d==23) ? "rd" : "th";
				break;
			case "W": formatted += theDayName; break;
			case "w": formatted += theDayName.slice(0,3); break;
			case "I": formatted += pad(theHour, 2); break;
			case "H":
				h = theHour % 12;
				if(h==0) h = 12;
				formatted += pad(h, 2);
				break;
			case "h":
				h = theHour % 12;
				if(h==0) h = 12;
				formatted += h;
				break;
			case "P": formatted += (theHour<12 ? "AM" : "PM"); break;
			case "p": formatted += (theHour<12 ? "am" : "pm"); break;
			case "q": formatted += (theHour<12 ? "a" : "p"); break;
			case "N": formatted += pad(theMinute, 2); break;
			case "n": formatted += theMinute; break;
			case "S": formatted += pad(theSecond, 2); break;
			case "s": formatted += theSecond; break;
			case "Z": formatted += pad(theMS, 3); break;
			case "z": formatted += theMS; break;
			case "e": formatted += theOffset < 0 ? "-" : "+"; break;	//if offset==0, it will be "+"
			case "F": formatted += pad(Math.floor(Math.abs(theOffset)/60), 2); break;
			case "f": formatted += Math.floor(Math.abs(theOffset)/60); break;
			case "G": formatted += pad(theOffset%60, 2); break;
			case "g": formatted += theOffset%60; break;
			case "%": formatted += "%"; break;
			default: formatted += m[0];
		}
		formatStr = formatStr.slice(m.index+2);
	}
	formatted += formatStr;
 
	return formatted;
}