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<!DOCTYPE html>
<html>
<head>
<script>
function startTime() {
  var today=new Date();
  var h=today.getHours();
  var m=today.getMinutes();
  var s=today.getSeconds();
  m = checkTime(m);
  s = checkTime(s);
  document.getElementById('txt').innerHTML = h+":"+m+":"+s;
  var t = setTimeout(function(){startTime()},500);
}
function checkTime(i) {
  if (i<10) {i = "0" + i};  // add zero in front of numbers < 10
  return i;
}
</script>
</head>
<body onload="startTime()">
<div id="txt"></div>
</body>
</html>
Output

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