Atlas,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<span id="doc_time"></span>
<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
<script>
function clock() {
var d = new Date();
var d1 = new Date(2018, 0, 1, 0, 0, 0, 0);
n=Math.floor((d1-d)/1000);
sec=n%60; n=Math.floor(n/60); if(sec<10)sec='0'+sec;
min=n%60; n=Math.floor(n/60); if(min<10)min='0'+min;
hour=n%24; n=Math.floor(n/24);
date_time=n+":"+hour+":"+min+":"+sec;
document.getElementById("doc_time").innerHTML = date_time;
window.setTimeout(clock,1000)
};
$(function() {
clock()
});
</script>
</body>
</html>