Calculate remaining time

countDown.js

		var diffSeconds = Math.round(new Date("September 21, 2013 12:00:00 PM").getTime()/1000.0) - Math.round(new Date().getTime()/1000.0);
		var days = Math.floor(diffSeconds / 86400);
		var hours = Math.floor(diffSeconds / 3600) % 24;
		var minutes = Math.floor(diffSeconds / 60) % 60;
		var seconds = diffSeconds % 60;

		function pad(number, length) {
			var str = '' + number;
			while (str.length < length) {
				str = '0' + str;
			}

			return str;
		}

		if (diffSeconds > 0) {
			var remainingTime = pad(days, 2) + ':' + pad(hours, 2) + ':' + pad(minutes, 2) + ':' + pad(seconds, 2);
		} else {
			var remainingTime = '00:00:00:00';
		}