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Hello, i'm tested and fixed your code. And it's works.
Code:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery UI Datepicker - Default functionality</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.11.2/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script>
$(document).ready(function() {
$("#datepicker").datepicker();
});
</script>
</head>
<body>
<p>Date: <input type="text" id="datepicker"></p>
</body>
</html>
