ROB — Wed, 03 Apr 2002 17:17:39 +0000
&lt;script language=javascript&gt;

function CheckDate(txtField) {
	// assumes input of MM/DD/YYYY
	var dateString = txtField.value;

	// trim whitespace
	dateString = dateString.replace(/^ */,"");
	dateString = dateString.replace(/ *$/,"");

	if(!/^\d{2}\/\d{2}\/\d{4}$/.test(dateString)) {
		alert("Date must be in the format MM/DD/YYYY");
		return;
	}

	var mm = dateString.substring(0,2);
	var dd = dateString.substring(3,5);
	var yy =dateString.substring(6);

	var now = new Date();
	now.getDate();
	var date = new Date(yy,mm-1,dd);

	if(date.getTime() > now.getTime()) {
		alert("The date cannot be in the future.");
		return;
	}
}

&lt;/script&gt;

<FORM>
<INPUT TYPE=text ONCHANGE="CheckDate(this)">
</FORM>