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HTML

<!doctype html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<title>jQuery UI Datepicker - Show week of the year</title>
	<link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
	<script src="//code.jquery.com/jquery-1.10.2.js"></script>
	<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
	<link rel="stylesheet" href="/resources/demos/style.css">
	<script>
	$(function() {
		$( "#datepicker" ).datepicker({
			showWeek: true,
			firstDay: 0
		});
	});
	</script>
</head>
<body>

<p>Date: <input type="text" id="datepicker"></p>


</body>
</html>