Edit report at http://bugs.php.net/bug.php?id=51051&edit=1
ID: 51051
Comment by: glennpratt at gmail dot com
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
New Comment:
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
Previous Comments:
------------------------------------------------------------------------
[2010-02-15 10:56:45] mehdi dot rande at aliasource dot fr
Sorry the expected result is in fact the actual result, and the actual
result is the expected result.
------------------------------------------------------------------------
[2010-02-15 10:55:19] mehdi dot rande at aliasource dot fr
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 this bug report at http://bugs.php.net/bug.php?id=51051&edit=1
