JQuery DateTimePicker
HTML
<head>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.8/themes/base/jquery-ui.css" type="text/css" media="all" />
<link rel="stylesheet" href="http://static.jquery.com/ui/css/demo-docs-theme/ui.theme.css" type="text/css" media="all" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.8/jquery-ui.min.js" type="text/javascript"></script>
<script src="http://jquery-ui.googlecode.com/svn/tags/latest/external/jquery.bgiframe-2.1.2.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.8/i18n/jquery-ui-i18n.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#txtName').datepicker();
});
</script>
</head>
<body>
<input type="text" id="txtName" />
<input type="text" id="txtRes" />
</body>
JavaScript
$('#txtName').change(function() {
var date2 = $('#txtName').datepicker('getDate');
date2.setHours(date2.getHours()+10);
alert(date2);
$('#txtRes').val(date2);
});