[PHP-DEV] Bug #10694 Updated: mktime leap year bug From: derick <email protected>
Date: 08/31/01

ID: 10694
Updated by: derick
Reported By: schnitten <email protected>
Status: Closed
Bug Type: Date/time related
Operating System: Redhat 6.2
PHP Version: 4.0.4
Assigned To: derick
New Comment:

Ok, I was just trying to explain the same thing after some
investigating...

Derick

Previous Comments:
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[2001-08-31 14:05:10] schnitten <email protected>

The problem is how you look at it:
mktime first calculates year + month...
the last step is to add the seconds.

I wanted this the other way round. Would be a nice feature to select the priority of the different input values. When you use unix timestamps for calculations its very difficult to add 1 year (or something similar) to that date...

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[2001-08-31 12:06:36] sander <email protected>

Status after almost three months???

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[2001-05-07 04:23:18] derick <email protected>

Assigning to myself

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[2001-05-07 01:50:21] schnitten <email protected>

first of all:
I use php 4.0.1pl2 and don't have the possibility to upgrade. Please verify with latest version.

I tried to add 12 months to a given timestamp and figured out that mktime() doesn't include a 29th February into its calculations. Effect is, that following code doesn't jump forward 1 year during each loop. Every leap year 1 day gets lost!

$a = mktime(0,0,0,1,1,1970);
for ($i=0; $i<20; $i++) {
        $a = mktime(0,0,3600 +$a,1+12,1,1970);
        $b = date("d-m-Y", $a);
        print "Date: $b<br>";
}

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Edit this bug report at http://bugs.php.net/?id=10694&edit=1 

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