How to compare dates in javascript

[ghjk]

I want to compare date in java script for validation. This is my code.

        var currentDate = new Date()
 	var day = currentDate.getDate()
  	var month = currentDate.getMonth()
  	var year = currentDate.getFullYear()
	var today = (year + "-" + month + "-" + day);
...
else if (ED > today){
	err= 'End Date cannot be grater than the current date!';

There are two text boxes to enter date. one is start date and the other one is end date. When user enter end date which is grater than start date I want to give error message. But I'll get error message when end date is current date. Where I goes wrong?

Ex: Start Date :2009-11-30
End Date: 2009-12-01
if the current date is 2009-12-02. I have got error message.

[RamananKalirajan]

var newDate = new Date(y,m,d);
var today = new Date();
dif = newDate-today;//difference in milliseconds
dif = Math.ceil(dif/1000/60/60/24);//difference in days
f.difD.value = dif + ' days';//assign the difference

This code will give you the exact day difference between two dates... The y, m, d in the first line of the code are the user entered date, month and year.

Thanks and Regards
Ramanan Kalirajan