Edit report at http://bugs.php.net/bug.php?id=51051&edit=1
ID: 51051
Comment by: j dot ek at gmx dot net
Reported by: mehdi dot rande at aliasource dot fr
Summary: DateTime modify wrong result with DST change
Status: Assigned
Type: Bug
Package: Date/time related
Operating System: Linux
PHP Version: 5.3.1
Assigned To: derick
Block user comment: N
Private report: N
New Comment:
Think I found a related issue, reproduce it with:
<?php
$dt = new DateTime('now', new DateTimeZone('Europe/Berlin'));
// try to set timestamp of 2010-10-31T02:00:00+0200
$dt->setTimestamp(1288483200);
// but returns timestamp of 2010-10-31T02:00:00+0100
echo $dt->getTimestamp(); // outputs 1288486800
?>
WinXP 32, PHP 5.3.2 (cli) (built: Mar 3 2010 20:36:54)
Previous Comments:
------------------------------------------------------------------------
[2010-12-25 02:46:45] danielc at analysisandsolutions dot com
DateTime::diff() is similarly afflicted with daylight/standard change
over issues. Naturally, diff/add/sub all need to be in sync so
intervals returned by diff can be passed to add/sub and produce the
original datetime.
------------------------------------------------------------------------
[2010-12-25 02:27:22] danielc@php.net
I just attached a test script that covers issues in the spring and fall.
------------------------------------------------------------------------
[2010-12-25 02:26:16] danielc@php.net
The following patch has been added/updated:
Patch Name: bug51051test.php.txt
Revision: 1293240376
URL:
http://bugs.php.net/patch-display.php?bug=51051&patch=bug51051test.php.txt&revision=1293240376
------------------------------------------------------------------------
[2010-08-24 14:34:22] glennpratt+php at gmail dot com
Correction for the Expected result above.
Expected Result
---------------
2011-03-13T03:00:00-05:00 America/Chicago
2011-03-13T01:58:00-06:00 America/Chicago
------------------------------------------------------------------------
[2010-08-24 00:04:28] glennpratt at gmail dot com
Same issue here on PHP 5.3.2
<?php
$date = new DateTime('2011-03-13T03:00:00',
timezone_open('America/Chicago'));
print($date->format('c e'));
$date->modify('-2 minutes');
print($date->format('c e'));
?>
Actual Result
-------------
2011-03-13T03:00:00-05:00 America/Chicago
2011-03-13T03:58:00-05:00 America/Chicago
Expected Result
---------------
2011-03-13T03:00:00-05:00 America/Chicago
2011-03-13T01:58:00-05:00 America/Chicago
Comparison: Ruby time library
-----------------------------
irb(main):015:0> date = Time.parse('2011-03-13T03:00:00 in CST')
=> Sun Mar 13 03:00:00 -0500 2011
irb(main):016:0> date - 120
=> Sun Mar 13 01:58:00 -0600 2011
------------------------------------------------------------------------
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