RE: Date addition problem

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> -----Original Message-----
> From: Adrian Bruce [mailto:abruce@xxxxxxxxxxxxxxx] 
> Sent: 29 March 2006 13:52
> 
> I am having an unusual problem when trying to calculate dates 
> in advance 
> from a start date.  the code below shows a loop where by on 
> each run an 
> increasing number of weeks is added to the start date, this works as 
> expected up untill the 8th time where for some reason it produces 
> 01-11-05 instead of 02-11-05.  I am at a loss as to why this would 
> happen when it works perfectly for all the other dates.  where am i 
> going wrong?
> 
> [snip]
> 
> <?php
> echo"<h1> date test</h1>";
> $start = "05-09-07";
> $start = explode('-',$start);
> $startmk = mktime(0,0,0,$start[1],$start[2],$start[0]);
> $startdate = date('d-m-y',$startmk);
> 
> for($i=0;$i<10;$i++){
>     $nextdate = date('d-m-y',$startmk + ($i*604800));
>     echo"<h1>$i:  $startdate -- -- --$nextdate</h1>";
> }
> ?>   

You're not allowing for DST shifts. 02-11-05 is after the clocks go back
an hour, so instead of getting 00:00 on 02-11-05 you're getting 11:00 on
01-11-05.

I always suggest working with the *other* 12 o'clock when calculating
purely date offsets -- 12:00 may still shift to 11:00 or 13:00, but this
will not affect the date!
Cheers!

Mike
 
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