#51051 [NEW]: DateTime modify wrong result with DST change

From:	mehdi dot rande at aliasource dot fr	Date:	Mon, 15 Feb 2010 10:55:20 +0000
Subject:	#51051 [NEW]: DateTime modify wrong result with DST change
Groups:	php.bugs
Request:	Send a blank email to php-bugs+get-147643@lists.php.net to get a copy of this message

From:             mehdi dot rande at aliasource dot fr
Operating system: Linux
PHP version:      5.3.1
PHP Bug Type:     Date/time related
Bug description:  DateTime modify wrong result with DST change

Description:
------------
When adding seconds (or minutes or hours) to a datetime via the modify 
method, if the date before modification is before the DST change and the 
date after modification is after the DST change, the date after 
modification will be wrong.
php 5.2 seems to be affected too.

Reproduce code:
---------------
<?php
$dateBefore = new DateTime("2012-10-27 12:00:00", new
DateTimezone("Europe/Paris"));
var_dump($dateBefore->format('c'));
// DST change : 2012-10-28 01:00:00
$dateAfter = new DateTime("2012-10-28 12:00:00", new
DateTimezone("Europe/Paris"));
var_dump($dateAfter->format('c'));
$diff = $dateAfter->format('U') - $dateBefore->format('U');
var_dump($diff); // === 25 hours, 
$dateBefore->modify('+'.$diff.' seconds');
var_dump($dateBefore->format('c'));
?>

Expected result:
----------------
string(25) "2012-10-27T12:00:00+02:00"
string(25) "2012-10-28T12:00:00+01:00"
int(90000)
string(25) "2012-10-28T13:00:00+01:00"


Actual result:
--------------
string(25) "2012-10-27T12:00:00+02:00"
string(25) "2012-10-28T12:00:00+01:00"
int(90000)
string(25) "2012-10-28T12:00:00+01:00"


-- 
Edit bug report at http://bugs.php.net/?id=51051&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=51051&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=51051&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=51051&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=51051&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51051&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=51051&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=51051&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=51051&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=51051&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=51051&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=51051&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=51051&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=51051&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=51051&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=51051&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=51051&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=51051&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=51051&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=51051&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=51051&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=51051&r=mysqlcfg



   

Thread (21 messages)

• mehdi dot rande at aliasource dot frMon, 15 Feb 2010 10:55:20 +0000
  • mehdi dot rande at aliasource dot frMon, 15 Feb 2010 10:56:45 +0000#51051 [Opn]: DateTime modify wrong result with DST change
  • derick@php.netMon, 15 Feb 2010 11:13:31 +0000#51051 [Opn->Asn]: DateTime modify wrong result with DST change
  • glennpratt at gmail dot comMon, 23 Aug 2010 22:04:28 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • glennpratt+php at gmail dot comTue, 24 Aug 2010 12:34:22 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • danielc@php.netSat, 25 Dec 2010 01:26:17 +0000Bug #51051 [PATCH]: DateTime modify wrong result with DST change
  • danielc@php.netSat, 25 Dec 2010 01:27:22 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • danielc at analysisandsolutions dot comSat, 25 Dec 2010 01:46:46 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • j dot ek at gmx dot netThu, 24 Feb 2011 16:07:56 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • halde at freenet dot deMon, 18 Apr 2011 15:30:13 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • danielc@php.netMon, 21 Nov 2011 02:43:15 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • webmaster at martinandersson dot comWed, 14 Mar 2012 14:36:41 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • kavi at postpro dot netThu, 17 May 2012 00:12:04 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • kavi at postpro dot netTue, 19 Mar 2013 18:09:03 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • joerg dot eichhorn at kiwigrid dot comThu, 30 May 2013 14:56:05 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • cvkline at gmail dot comSun, 13 Mar 2016 23:52:56 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • dasistmeine-mail at gmx dot deTue, 19 Jul 2016 09:26:50 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • nicholas dot leon at wellsfargo dot comThu, 06 Oct 2016 15:54:12 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • rado at max dot siWed, 12 Oct 2016 09:15:59 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • rado at max dot siWed, 12 Oct 2016 09:23:05 +0000Bug #51051 [Com]: DateTime modify wrong result with DST change
  • heiglandreas@php.netSun, 19 Mar 2017 10:10:51 +0000Bug #51051 [Asn->Dup]: DateTime modify wrong result with DST change