Here is a code snippet i have done in html in which i have designed a date picker which accepts the date in the format dd/mm/yy. Hopes it will help you
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>jQuery UI Datepicker - Default functionality</title>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css"/>
<script type="text/javascript"src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript" src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css"/>
<script type="text/javascript">
$(function () {
$("#datepicker").datepicker({ dateFormat: 'dd/mm/y' });
});
</script>
</head>
<body>
<form id="form1" runat="server">
<p>Date:<input ID="datepicker" runat="server"/></p>
</form>
</body>
</html>