Try it, it should work
<script language="javascript">
function validateDate(oSrc, args)
{
var iDay, iMonth, iYear;
var arrValues;
arrValues = args.Value.split("/");
iMonth = arrValues[0];
iDay = arrValues[1];
iYear = arrValues[2];
var testDate = new Date(iYear, iMonth - 1, iDay);
if ((testDate.getDate() != iDay) ||
(testDate.getMonth() != iMonth - 1) ||
(testDate.getFullYear() != iYear))
{
args.IsValid = false;
return;
}
return true;
}
</script>
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