<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<script type="text/javascript">
function IsValidDate(myDate) {
var filter = /^([012]?\d|3[01])-([Jj][Aa][Nn]|[Ff][Ee][bB]|[Mm][Aa][Rr]|[Aa][Pp][Rr]|[Mm][Aa][Yy]|[Jj][Uu][Nn]|[Jj][u]l|[aA][Uu][gG]|[Ss][eE][pP]|[oO][Cc]|[Nn][oO][Vv]|[Dd][Ee][Cc])-(19|20)\d\d$/
return filter.test(myDate);
}
function test() {
var txtTest = document.getElementById('txtTest');
var isValid = IsValidDate(txtTest.value);
if (isValid) {
alert('Correct format');
}
else {
alert('Incorrect format');
}
return isValid
}
</script>
</head>
<body>
<input id="txtTest" type="text" />
<input id="btnTest" type="button" value="button" onclick="return test();"/>
</body>
</html>