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<!DOCTYPE html>
<html>
<body>

<p>The internal clock in JavaScript starts at midnight January 1, 1970.</p>
<p>The getTime() function returns the number of milliseconds since then:</p>

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

<script>
var d = new Date();
document.getElementById("demo").innerHTML = d.getTime();
</script>

</body>
</html>