JavaScript getTime method
<html>
<body>
<script type="text/javascript">
var d=new Date();
document.write(d.getTime() + " milliseconds since 1970/01/01");
</script>
</body>
</html>
<body>
<script type="text/javascript">
var d=new Date();
document.write(d.getTime() + " milliseconds since 1970/01/01");
</script>
</body>
</html>
Result
