Alternate of http://bl.ocks.org/svmatthews/6123346

<!DOCTYPE html>
<head>
<style>
    body {
    	text-align:center;
    }
    #clock {
    	font-family:arial;
    	font-size:2em;
    	font-weight:bold;
    	color:#555;
    }
</style>
</head>

<body>
	<p id="clock"></p>
<script>
(function() {
    var end = new Date('08/19/2013 10:1 AM'),
        sec = 1000,
        min = sec * 60,
        hour = min * 60,
        day = hour * 24,
        timer;

timer = setInterval(function () {
        var now = new Date(),
            between = end - now;

var days = Math.floor(between / day),
            hours = Math.floor((between % day) / hour),
            minutes = Math.floor((between % hour) / min),
            seconds = Math.floor((between % min) / sec);

var dayString = 'days ',
            hourString = 'hrs ',
            minString = 'mins ',
            secString = 'secs ';

if (days == 1) {
            dayString = 'day ';
        };
        if (hours == 1) {
            hourString = 'hr ';
        };
        if (minutes == 1) {
            minString = 'min ';
        };
        if (seconds == 1) {
            secString = 'sec ';
        };
        var clock = days + dayString + hours + hourString + minutes + minString + seconds + secString;
        document.getElementById("clock").innerHTML = clock;
    }, 1000);

})();

</script>
	
</body>
</html>