<html>
<body>
<p id="demo">Click the button to display the numbers of milliseconds between a specified date and midnight January 1, 1970.</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction()
{
var d = Date.UTC(2012,02,30);
var x = document.getElementById("demo");
x.innerHTML=d;
}
</script>
</body>
</html>