Days <span id='Days'>874</span><br>
Hours <span id='Hours'>0</span><br>
Minutes <span id='Minutes'>21</span><br>
Seconds <span id='Seconds'>35</span><br>
<script type="text/javascript">
	
(function(){
	
	var Days = document.getElementById('Days');
	var Hours = document.getElementById('Hours');
	var Minutes = document.getElementById('Minutes');
	var Seconds = document.getElementById('Seconds');
	
	var d = parseInt(Days.innerHTML);
	var h = parseInt(Hours.innerHTML);
	var m = parseInt(Minutes.innerHTML);
	var s = parseInt(Seconds.innerHTML);
	
	var interval = setInterval(function(){
		
		s++;
		if( s > 59) {
			s = 0;
			m++;
			if( m > 59 ) {
				m = 0;
				h++;
				if( h > 59 ) {
					h = 0;
					d++;
				}
			}
		}
		
		Days.innerHTML = d;
		Hours.innerHTML = h;
		Minutes.innerHTML = m;
		Seconds.innerHTML = s;
		
	
	}, 1000);
})();

</script>