Date Format

	Date.prototype.format = function(f) {
		if (!this.valueOf()) return " ";

		var weekName = ["일요일", "월요일", "화요일", "수요일", "목요일", "금요일", "토요일"];
		var d = this;

		return f.replace(/(yyyy|yy|MM|dd|E|hh|mm|ss|a\/p)/gi, function($1) {
			switch ($1) {
				case "yyyy": return d.getFullYear();
				case "yy": return (d.getFullYear() % 1000).zf(2);
				case "MM": return (d.getMonth() + 1).zf(2);
				case "dd": return d.getDate().zf(2);
				case "E": return weekName[d.getDay()];
				case "HH": return d.getHours().zf(2);
				case "hh": return ((h = d.getHours() % 12) ? h : 12).zf(2);
				case "mm": return d.getMinutes().zf(2);
				case "ss": return d.getSeconds().zf(2);
				case "a/p": return d.getHours() < 12 ? "오전" : "오후";
				default: return $1;
			}
		});
	};
	
	String.prototype.string = function(len){var s = '', i = 0; while (i++ < len) { s += this; } return s;};
	String.prototype.zf = function(len){return "0".string(len - this.length) + this;};
	Number.prototype.zf = function(len){return this.toString().zf(len);};

사용법

new Date().format("yyyy-MM-dd")

; 출처: http://stove99.tistory.com/46