<html>
<body>
<h1>JavaScript Dates</h1>
<h2>The getTime() Method</h2>
<p></p>
<p>Return the number of milliseconds since midnight January 1, 1970:</p>
<p id="demo"></p>
<script>
const d = new Date("2021-03-25");
document.getElementById("demo").innerHTML = d.getTime();
</script>
</body>
</html>