Replicate PHP's native date() formatting in JavaScript for many common format types

dateFormat.js

	/**
	 * Return a formated string from a date Object mimicking PHP's date() functionality
	 *
	 * format  string  "Y-m-d H:i:s" or similar PHP-style date format string
	 * date    mixed   Date Object, Datestring, or milliseconds
	 *
	 */
	function date_format(format,date){

		if(!date || date === "")
		{
			date = new Date();
		}
		else if(typeof(date) !== 'object')
		{
			date = new Date(date.replace(/-/g,"/")); // attempt to convert string to date object
		}

		var string = '',
			mo = date.getMonth(),   // month (0-11)
			m1 = mo+1,			    // month (1-12)
			dow = date.getDay(),    // day of week (0-6)
			d = date.getDate(),     // day of the month (1-31)
			y = date.getFullYear(), // 1999 or 2003
			h = date.getHours(),    // hour (0-23)
			mi = date.getMinutes(), // minute (0-59)
			s = date.getSeconds();  // seconds (0-59)

		for (var i = 0, len = format.length; i < len; i++) {
			switch(format[i])
			{
				case 'j': // Day of the month without leading zeros  (1 to 31)
					string+= d;
					break;

				case 'd': // Day of the month, 2 digits with leading zeros (01 to 31)
					string+= (d < 10) ? "0"+d : d;
					break;

				case 'l': // (lowercase 'L') A full textual representation of the day of the week
					var days = Array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday");
					string+= days[dow];
					break;

				case 'w': // Numeric representation of the day of the week (0=Sunday,1=Monday,...6=Saturday)
					string+= dow;
					break;

				case 'D': // A textual representation of a day, three letters
					days = Array("Sun","Mon","Tue","Wed","Thr","Fri","Sat");
					string+= days[dow];
					break;

				case 'm': // Numeric representation of a month, with leading zeros (01 to 12)
					string+= (m1 < 10) ? "0"+m1 : m1;
					break;

				case 'n': // Numeric representation of a month, without leading zeros (1 to 12)
					string+= m1;
					break;

				case 'F': // A full textual representation of a month, such as January or March
					var months = Array("January","February","March","April","May","June","July","August","September","October","November","December");
					string+= months[mo];
					break;

				case 'M': // A short textual representation of a month, three letters (Jan - Dec)
					months = Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
					string+= months[mo];
					break;

				case 'Y': // A full numeric representation of a year, 4 digits (1999 OR 2003)
					string+= y;
					break;

				case 'y': // A two digit representation of a year (99 OR 03)
					string+= y.toString().slice(-2);
					break;

				case 'H': // 24-hour format of an hour with leading zeros (00 to 23)
					string+= (h < 10) ? "0"+h : h;
					break;

				case 'g': // 12-hour format of an hour without leading zeros (1 to 12)
					var hour = (h===0) ? 12 : h;
					string+= (hour > 12) ? hour -12 : hour;
					break;

				case 'h': // 12-hour format of an hour with leading zeros (01 to 12)
					hour = (h===0) ? 12 : h;
					hour = ( hour > 12) ? hour -12 : hour;
					string+= (hour < 10) ? "0"+hour : hour;
					break;

				case 'a': // Lowercase Ante meridiem and Post meridiem (am or pm)
					string+= (h < 12) ? "am" : "pm";
					break;

				case 'i': // Minutes with leading zeros (00 to 59)
					string+= (mi < 10) ? "0"+mi : mi;
					break;

				case 's': // Seconds, with leading zeros (00 to 59)
					string+= (s < 10) ? "0"+s : s;
					break;

				case 'c': // ISO 8601 date (eg: 2012-11-20T18:05:54.944Z)
					string+= date.toISOString();
					break;

				case 'S': // English ordinal suffix for the day of the month, 2 characters (e.g. st, nd, rd or th)
					var suffix = '';
					var j = i % 10,
					k = i % 100;
					if(j == 1 && k != 11) {
						suffix = "st";
					}
					if (j == 2 && k != 12) {
						suffix = "nd";
					}
					if (j == 3 && k != 13) {
						suffix = "rd";
					}
					suffix = "th";

					string+= suffix;
					break;

				default:
					string+= format[i];
			}
		}

		return string;
	}