Try following:
<script type="text/javascript" language="javascript">
$(document).ready(function() {
$("#<%= TextBox1.ClientID %>").datepicker({
dateFormat: 'mm/dd/yy',
buttonImage: '/images/folders/date.png',
buttonText: 'Choose date',
firstDay: 1,
buttonImageOnly: true,
showOn: 'both',
showAnim: 'fadeIn',
minDate: '0',
maxDate: +30,
onSelect: function() { $(this).trigger("onchange", null); }
});
});
</script>
I hope the above information will be helpful. If you have more concerns, please let me know.