Hi makenzi.exc,
Use getMinutes method of Date object.
Refer below example.
HTML
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body { font-family: Arial; font-size: 10pt; }
</style>
</head>
<body>
<input type="button" value="Get Minutes" onclick="GetMinutes()" />
<script type="text/javascript">
function GetMinutes() {
//Current Date object.
var dt = new Date();
// Get Minutes.
var minutes = dt.getMinutes();
alert("Minute is: " + minutes);
}
</script>
</body>
</html>
Demo
Screenshot

Downloads
Download Sample