Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>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>

<p id="demo"></p>

<script>
function myFunction() {
    var d = Date.UTC(2012, 02, 30);
    document.getElementById("demo").innerHTML = d;
}
</script>

</body>
</html>