Javascript dateDiff function

Posted by Paul Klinkenberg in jQuery + Javascript on July 5, 2010

I needed a function to check the difference between 2 dates in javascript. I couldn't find a suitable one, so I created this one:

function dateDiff(datepart, fromdate, todate)// datepart: 'w', 'd', 'h', 'n', 's'
{
	datepart = datepart.toLowerCase();
	var diff = todate - fromdate;
	var divideBy = {
		  w:604800000 //1000*60*60*24*7
		, d:86400000 // 1000*60*60*24
		, h:3600000 // 1000*60*60
		, n:60000 // 1000*60
		, s:1000
	};
	return Math.floor(diff/divideBy[datepart]);
}
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  1. Dan G. Switzer, II

    #1 by Dan G. Switzer, II - July 8, 2010 at 6:15 PM

    I'd recommend actually moving the calculation to comments and hardcode the calculations for your divideBy object, this will speed things especially if this function is used a lot in your code.

    The overhead may not be much on a single call, but considering you're doing 5 calculation on each call to the function and the values don't change, it'll be more efficient to just hardcode the values and leave the equation as a comment for reference.
    Reply
  2. Paul Klinkenberg

    #2 by Paul Klinkenberg - July 9, 2010 at 1:36 PM

    Thanks Dan, you're absolutely right! The reason why I left it with the calculations inside was "human readability", but adding those as a comment is much better, and serves the same cause.
    Regards, Paul
    Reply
  3. Dave Stillman

    #3 by Dave Stillman - September 28, 2011 at 12:47 AM

    I've been looking for a datediff function in javascript, and this is a fantastic, simple solution. Thanks for posting this.
    Reply
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