compare two dates

[mwl707]

I am trying to compare two dates , I have this code which I thought would work a treat but it didn't . For now I just want to alert an error if the enddate is less than the start date . The date style yyyy-mm-dd needs to be kept in this format for other events prior to this. can anyone give me a clue ? thanks

 

startdate = "2009-11-01" ;

enddate  = "2009-11-04" ;

 

var d1 = new Date(startdate)

var d2 = new Date(enddate)

 

if (d2 < d1) {

alert ("Error ! ) ;

}

 

 

document.cookie='st =' + startdate // set sytem cookie

document.cookie='en =' + enddate

window.location = self.location.href

window.opener.location.reload()

close()

[Adam]

You can't pass a date string to the Date() object like that. You can just remove all the date object stuff though and compare between the startdate and enddate variables:

 

   var startdate = "2009-11-01";
   var enddate  = "2009-11-04" ;
   
   if (startdate > enddate) {
      alert ("Error !") ;
   }

(...)

 

If you have a good read up on the Date() object you'll understand how/when to use it better.

 

There was also a missing quote after: "Error !

[Psycho]

You can't pass a date string to the Date() object like that.

 

Not true. You can't pass a date to the Date() object that it does not understand. But, it can parse a string into a date object. But, it only parses dates in the format the humans use, not what machines use yyyy-mm-dd.

 

Here are some acceptable methods of creating a date object from a string (note that some of these may depend on the user's locale setting since many countries use dd-mm-yyyy, whereas the US uses mm-dd-yyyy)

 

var dateObj = new Date('Oct 31, 1968 12:11:32');
var dateObj = new Date('October 31, 1968 12:11:32');
var dateObj = new Date('10/31/1968');
var dateObj = new Date('10/31/68');