Try it Editor: JavaScript setDate()

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<!DOCTYPE html>
<html>
<body>

<h2>JavaScript setDate()</h2>

<p>The setDate() method sets the day of a date object:</p>

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

<script>
var d = new Date();
d.setDate(15);
document.getElementById("demo").innerHTML = d;
</script>

</body>
</html>

Result :