/*
 * Date Format 1.2.3
 * (c) 2007-2009 Steven Levithan <stevenlevithan.com>
 * MIT license
 *
 * Includes enhancements by Scott Trenda <scott.trenda.net>
 * and Kris Kowal <cixar.com/~kris.kowal/>
 *
 * Accepts a date, a mask, or a date and a mask.
 * Returns a formatted version of the given date.
 * The date defaults to the current date/time.
 * The mask defaults to dateFormat.masks.default.
 */

/*
	Mask 	Description

	d 		Day of the month as digits; no leading zero for single-digit days.
	dd 		Day of the month as digits; leading zero for single-digit days.
	ddd 	Day of the week as a three-letter abbreviation.
	dddd 	Day of the week as its full name.
	m 		Month as digits; no leading zero for single-digit months.
	mm 		Month as digits; leading zero for single-digit months.
	mmm 	Month as a three-letter abbreviation.
	mmmm 	Month as its full name.
	yy 		Year as last two digits; leading zero for years less than 10.
	yyyy 	Year represented by four digits.
	h 		Hours; no leading zero for single-digit hours (12-hour clock).
	hh 		Hours; leading zero for single-digit hours (12-hour clock).
	H 		Hours; no leading zero for single-digit hours (24-hour clock).
	HH 		Hours; leading zero for single-digit hours (24-hour clock).
	M 		Minutes; no leading zero for single-digit minutes.
			Uppercase M to avoid conflict with months.
	MM 		Minutes; leading zero for single-digit minutes.
			Uppercase MM to avoid conflict with months.
	s 		Seconds; no leading zero for single-digit seconds.
	ss 		Seconds; leading zero for single-digit seconds.
	l or L 	Milliseconds. l gives 3 digits. L gives 2 digits.
	t 		Lowercase, single-character time marker string: a or p.
	tt 		Lowercase, two-character time marker string: am or pm.
	ttt		Number of milliseconds since 1/1/1970 @ 12:00 AM
	T 		Uppercase, single-character time marker string: A or P.
			Uppercase T to allow for user-specified casing.
	TT 		Uppercase, two-character time marker string: AM or PM.
			Uppercase TT to allow for user-specified casing.
	Z 		US timezone abbreviation, e.g. EST or MDT. With non-US timezones or in the Opera browser, the GMT/UTC offset is returned, e.g. GMT-0500
	o 		GMT/UTC timezone offset, e.g. -0500 or +0230.
	S 		The date's ordinal suffix (st, nd, rd, or th). Works well with d.

	'…' or "…" 	Literal character sequence. Surrounding quotes are removed.
	UTC: 	Must be the first four characters of the mask. Converts the date from local time to UTC/GMT/Zulu time before applying the mask. The "UTC:" prefix is removed.


	And here are the named masks provided by default (you can easily change these or add your own in code bellow):
	Name 			Mask 							Example
	default 		ddd mmm dd yyyy HH:MM:ss 		Sat Jun 09 2007 17:46:21
	shortDate 		m/d/yy 							6/9/07
	mediumDate 		mmm d, yyyy 					Jun 9, 2007
	longDate 		mmmm d, yyyy 					June 9, 2007
	fullDate 		dddd, mmmm d, yyyy 				Saturday, June 9, 2007
	shortTime 		h:MM TT 						5:46 PM
	mediumTime 		h:MM:ss TT 						5:46:21 PM
	longTime 		h:MM:ss TT Z 					5:46:21 PM EST
	isoDate 		yyyy-mm-dd 						2007-06-09
	isoTime 		HH:MM:ss 						17:46:21
	isoDateTime 	yyyy-mm-dd'T'HH:MM:ss 			2007-06-09T17:46:21
	isoUtcDateTime 	UTC:yyyy-mm-dd'T'HH:MM:ss'Z' 	2007-06-09T22:46:21Z
	asLong			ttt								1308296231187


	A couple issues:

	1) In the unlikely event that there is ambiguity in the meaning of your mask (e.g., m followed by mm, with no separating characters), put a pair of empty quotes between your metasequences. 
		The quotes will be removed automatically.
	2) If you need to include literal quotes in your mask, the following rules apply:
		Unpaired quotes do not need special handling.
		To include literal quotes inside masks which contain any other quote marks of the same type, you need to enclose them with the 
		alternative quote type (i.e., double quotes for single quotes, and vice versa). 
		E.g., date.format('h "o\'clock, y\'all!"') returns "6 o'clock, y'all". 
		This can get a little hairy, perhaps, but I doubt people will really run into it that often. 
		The previous example can also be written as date.format("h") + "o'clock, y'all!".
*/

var dateFormat = function () 
{
	var	token = /d{1,4}|m{1,4}|t{3}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
		timezoneClip = /[^-+\dA-Z]/g,
		pad = function (val, len) 
		{
			val = '' + val;
			if(typeof(len) == 'undefined' || len <= 0)
			{
				len = 2;
			}
			while (val.length < len) 
			{
				val = "0" + val;
			}
			return val;
		};

	// Regexes and supporting functions are cached through closure
	return function (date, mask, utc) {
		var dF = dateFormat;

		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
		if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
			mask = date;
			date = undefined;
		}

		// Passing date through Date applies Date.parse, if necessary
		//date = date ? new Date(date) : new Date; // if uncomment - will lose at least milliseconds
		if (isNaN(date)) throw SyntaxError("invalid date");

		mask = String(dF.masks[mask] || mask || dF.masks["default"]);

		// Allow setting the utc argument via the mask
		if (mask.slice(0, 4) == "UTC:") {
			mask = mask.slice(4);
			utc = true;
		}

		var	_ = utc ? "getUTC" : "get",
			d = date[_ + "Date"](),
			D = date[_ + "Day"](),
			m = date[_ + "Month"](),
			y = date[_ + "FullYear"](),
			H = date[_ + "Hours"](),
			M = date[_ + "Minutes"](),
			s = date[_ + "Seconds"](),
			L = date[_ + "Milliseconds"](),
			ttt = date["getTime"](),
			o = utc ? 0 : date.getTimezoneOffset(),
			flags = {
				d:    d,
				dd:   pad(d),
				ddd:  dF.i18n.dayNames[D],
				dddd: dF.i18n.dayNames[D + 7],
				m:    m + 1,
				mm:   pad(m + 1),
				mmm:  dF.i18n.monthNames[m],
				mmmm: dF.i18n.monthNames[m + 12],
				yy:   String(y).slice(2),
				yyyy: y,
				h:    H % 12 ? H % 12 : 12,
				hh:   pad(H % 12 ? H % 12 : 12),
				H:    H,
				HH:   pad(H),
				M:    M,
				MM:   pad(M),
				s:    s,
				ss:   pad(s),
				l:    pad(L, 3),
				L:    pad(L > 99 ? Math.round(L / 10) : L),
				t:    H < 12 ? "a"  : "p",
				tt:   H < 12 ? "am" : "pm",
				ttt:  ttt,
				T:    H < 12 ? "A"  : "P",
				TT:   H < 12 ? "AM" : "PM",
				Z:    utc ? "UTC" : (String(date).match(timezone) ? String(date).match(timezone) : [""]).pop().replace(timezoneClip, ""),
				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
			};

		return mask.replace(token, function ($0) {
			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
		});
	};
}();

// Some common format strings
dateFormat.masks = {
	"default":      "ddd mmm dd yyyy HH:MM:ss",
	shortDate:      "m/d/yy",
	mediumDate:     "mmm d, yyyy",
	longDate:       "mmmm d, yyyy",
	fullDate:       "dddd, mmmm d, yyyy",
	shortTime:      "h:MM TT",
	mediumTime:     "h:MM:ss TT",
	longTime:       "h:MM:ss TT Z",
	isoDate:        "yyyy-mm-dd",
	isoTime:        "HH:MM:ss",
	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'",
	asLong:			"ttt"
};

// Internationalization strings
dateFormat.i18n = 
{
	dayNames: 
	[
		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
	],
	monthNames: 
	[
		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
		"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
	]
};

// For convenience...
Date.prototype.format = function (mask, utc) 
{
	return dateFormat(this, mask, utc);
};
