Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to display a date after changing the year, month, and day.</p>

<button onclick="myFunction()">Try it</button>

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

<script>
function myFunction() {
    var d = new Date();
    d.setFullYear(2020, 10, 3);
    document.getElementById("demo").innerHTML = d;
}
</script>

<p><strong>Note:</strong> Remember that JavaScript counts months from 0 to 11. Month 10 is November.</p>

</body>
</html>