To add hours and minutes to a date, use the setHours() and setMinutes() method in JavaScript.
Example
You can try to run the following code to add hours and minutes −
<html>
<head>
<title>JavaScript Dates</title>
</head>
<body>
<script>
var dt = new Date();
document.write("Current Date: "+dt);
dt.setHours(dt.getHours() + 2);
dt.setMinutes(dt.getMinutes() + 20);
document.write("<br>Updated Date: "+dt);
</script>
</body>
</html>