Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Date.parse() returns the number of milliseconds between the date and January 1, 1970:</p>

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

<script>
var msec = Date.parse("March 21, 2012");
document.getElementById("demo").innerHTML = msec;
</script>

</body>
</html>