<script type="text/javascript">
function checkFutureDate(date) {
var dtOrder = parseInt(date.substring(0, 2), 10);
var monOrder = parseInt(date.substring(3, 5), 10);
var yrOrder = parseInt(date.substring(6, 10), 10);
var dateOrder = new Date(yrOrder, monOrder, dtOrder);
if (dateOrder > new Date()) {
alert("You cannot enter date later than today ");
// sender._selectedDate = new Date();
// set the date back to the current date
// sender._textbox.set_Value(sender._selectedDate.format(sender._format))
}
}
</script>
First Divide Date And Then Arrange whatever date format you need...