date comparison

artsapimp posted this at 11:50 — 25th March 2002.

Joined: Apr 2000

I have a textbox which should be filled in with a date value. I don't want the user using any date later than today. I have the ability of using ASP to change the date on the backed and now the customer wants to have an alert explaining to the rep what the problem is.

How would I compare a date in a textbox to today using javascript?

Thanks.

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ROB posted this at 17:17 — 3rd April 2002.

They have: 447 posts

Joined: Oct 1999

&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>