Date pickers are very common in forms, and iService supports date fields within contact and interaction properties. If you are passing a date to one of these properties it should always be in the format YYYY-MM-DD.
The code below can be used to embed a simple date picker into iService forms.
<html>
<head>
<link rel="stylesheet" type="text/css" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.15/themes/redmond/jquery-ui.css" />
</head>
<body>
Enter Date: <input class="datepicker" type="text" name="StartDate" id="StartDate" /><br />
$input -id'StartDate' -customhtml$
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.15/jquery-ui.min.js"></script>
<script>
$(document).ready(function () {
$(".datepicker").datepicker({ dateFormat: 'yy-mm-dd', changeMonth: true, changeYear: true, selectDefaultDate: false, defaultDate: null });
});
</script>
</body>
</html>