Hi makenzi.exc,
Refer below example.
HTML
<!DOCTYPE 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="Submit" onclick="GetFormatedDate()" />
<script type="text/javascript">
function GetFormatedDate() {
var dt = new Date(2025, 01, 15);
// Get Year.
var year = dt.getFullYear();
// Get Month.
var month = dt.getMonth() + 1;
// Get Date.
var date = dt.getDate();
if (date < 10) { date = date.toString().padStart(2, '0') };
if (month < 10) { month = month.toString().padStart(2, '0') };
alert(date + '/' + month + '/' + year);
};
</script>
</body>
</html>
Demo
Screenshot

Downloads
Download Sample