Compare Dates in JS

apd8x · June 13th, 2003, 01:25 PM

I have a field that is called ExpireDate. The user enters a date in M/D/YYYY format. I want to compare Expiration Date with today's date. If the Expiration date is less or equal to today's date then I want a message to appear that says "Your product is already expired". Please help with the date compare. This is what I have so far:

function CheckExpire()
{
var currdate = new Date()

if (document.form.ExpireDate.value <= currdate) //Need help here
window.open("Your product is already expired")
}

bluckcuck · June 13th, 2003, 02:29 PM

Change your code around to be like this:

Code:

function CheckExpire()
{
var currdate = new Date()
var userdate = new Date(document.form.ExpireDate.value)

if (userdate <= currdate){
    window.open("Your product is already expired")
}

You should also probably check for a valid entry in the form field. If the field was null, the userdate date object would evaluate to the current date and time, which would cause the code to say the product is expired.

A good book for Javascript is the Javascript Bible

Bruce Luckcuck
Director, Applications & Support Services
Wiley Publishing, Inc.

ahrv · June 16th, 2003, 05:08 AM

they window.open as product is put will not work.
why you do not use
alert("Your product is already expired")
?

Moharo · June 16th, 2003, 05:36 AM

i've also done this for my project....

check www.peno.com.pl/voytech/register.php

see where you type the month and year

the genuine genius

apd8x · June 16th, 2003, 08:27 AM

Thanks for the posts. Making var userdate = new Date(document.form.ExpireDate.value) worked. I was able to compare the dates this way.

Also, I meant to put window.alert (" MESSAGE") not window.open. Thanks.