Make your page require the date picker code
Make your page require the date picker code
$xwiki.jsx.use("XWiki.DatePickerExtension")
$xwiki.ssx.use("XWiki.DatePickerExtension")
Use the date picker
<script type="text/javascript">
var dpicker = new DatePicker({
relative : 'mydate_id',
language: "$context.language"
});
</script>
Original code from http://prototype-datepicker-widget.googlecode.com/ where you may found more documentation.