If you are using jQuery UI, you can format any date with:
<html>
<body>
Your date formated: <span id="date1"></span><br/>
</body>
</html>
var myDate = '30.11.2011';
var parsedDate = $.datepicker.parseDate('dd.mm.yy', myDate);
$('#date1').text($.datepicker.formatDate('M d, yy', parsedDate));