calculating diference between to dates

[jazzmaster111]

Hi!

I'm trying to calculate the number of days between to dates, I have downloaded an example of a web page.

http://www.mcfedries.com/JavaScript/DaysBetween.asp

I think the function is right but if I want to calculate the number of days between 2005/2/28 and 2005/3/1 it returns 4.

If I want to calculate the number of days between 2005/11/30 and 2005/12/1 it returns 2.

What could be wrong??

Thanks!!

This is the code

<script language="JavaScript" type="text/javascript">
<!--

function days_between(date1, date2) {

// The number of milliseconds in one day
var ONE_DAY = 1000 * 60 * 60 * 24

// Convert both dates to milliseconds
var date1_ms = date1.getTime()
var date2_ms = date2.getTime()

// Calculate the difference in milliseconds
var difference_ms = Math.abs(date1_ms - date2_ms)

// Convert back to days and return
return Math.round(difference_ms/ONE_DAY)

}

//-->
</script>

 

[BillyRayPreachersSon]

Do the date objects definately hold the right dates? Try alerting date1 and date2 at the start of the function, and ensure that they look right.

Dan


[tt]D'ya think I got where I am today because I dress like Peter Pan here?[/tt]

 

[tsuji]

jazzmaster111,

js date object's month is zero-based if you establish it with new Date where you might think it is most user-friendly. It's crazy, is it not?
[tt] date1=new Date(2005,2,28)
date2=new Date(2005,3,1)[/tt]
Contrary to what you might think, it measn 28 Mar 2005 and 1 Apr 2005. Hence the result 4. And then
[tt] date1=new Date(2005,11,30)
date2=new Date(2005,12,1)[/tt]
You get 30 Dec 2005 and 1 Jan 2006 (automatically). Hence the result 2.

regards - tsuji

 

[jazzmaster111]

you are right tsuji!!