JavaScript DateFormat

// Format date or time.
Date.prototype.format = function(format) {
	/*
	 * eg:format="yyyy-MM-dd hh:mm:ss";
	 */
	if (!format) {
		format = "yyyy-MM-dd hh:mm:ss";
	}
	var o = {
		"M+" : this.getMonth() + 1, // month
		"d+" : this.getDate(), // day
		"h+" : this.getHours(), // hour
		"m+" : this.getMinutes(), // minute
		"s+" : this.getSeconds(), // second
		"q+" : Math.floor((this.getMonth() + 3) / 3), // quarter
		"S" : this.getMilliseconds()
		// millisecond
	};
	if (/(y+)/.test(format)) {
		format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4
						- RegExp.$1.length));
	}

	for (var k in o) {
		if (new RegExp("(" + k + ")").test(format)) {
			format = format.replace(RegExp.$1, RegExp.$1.length == 1
							? o[k]
							: ("00" + o[k]).substr(("" + o[k]).length));
		}
	}
	return format;
};