Edit report at https://bugs.php.net/bug.php?id=63311&edit=1
ID: 63311
Comment by: jan dot machala at email dot cz
Reported by: thomas dot mayer at 2bis10 dot de
Summary: DateTime::add() adds wrong interval when switching
from summer to winter time
Status: Open
Type: Bug
Package: Date/time related
Operating System: Windows 7, debian 6
PHP Version: 5.4.8
Block user comment: N
Private report: N
New Comment:
Problem still persists in newest php versions. There is online php shell test, which detects which
php versions are affected (https://3v4l.org/femQK).
Previous Comments:
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[2014-11-11 08:21:26] YAfrourner5561 at superrito dot com
Bug still persists
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[2014-03-31 11:37:28] nj dot johansson at gmail dot com
Seems like there are many similar reported bugs that might be related to the same underlying issue:
https://bugs.php.net/bug.php?id=51051https://bugs.php.net/bug.php?id=60960https://bugs.php.net/bug.php?id=61530https://bugs.php.net/bug.php?id=62331https://bugs.php.net/bug.php?id=62327
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[2014-03-31 11:27:18] nj dot johansson at gmail dot com
Experiencing the same thing on PHP 5.4.26 (RHEL 5.6) when subtracting an hour at the time across DST
boundary.
Test script:
---------------
// Init DateTime after DST change
$dt = new DateTime('2014-03-30 05:03:00', new DateTimeZone('Europe/Berlin'));
$di = new DateInterval('PT1H');
// Subtract one hour each time and notice how time is stuck
echo $dt->format('Y-m-d H:i:s') . "\n";
$dt->sub($di);
echo $dt->format('Y-m-d H:i:s') . "\n";
$dt->sub($di);
echo $dt->format('Y-m-d H:i:s') . "\n";
$dt->sub($di);
echo $dt->format('Y-m-d H:i:s') . "\n";
$dt->sub($di);
echo $dt->format('Y-m-d H:i:s') . "\n";
Result:
-----------------
2014-03-30 05:03:00
2014-03-30 04:03:00
2014-03-30 03:03:00
2014-03-30 03:03:00
2014-03-30 03:03:00
2014-03-30 03:03:00
------------------------------------------------------------------------
[2013-07-03 15:01:06] mas at crosscan dot com
For me it seems not to be directly connected with switching from or to DST.
I tried the following
Test script:
----------------
date_default_timezone_set( 'Europe/Berlin' );
$date = new \DateTime( '@0' );
echo $date->format('c')."\n";
$interval = new \DateInterval( 'PT1H' );
$date->add($interval);
echo $date->format('c')."\n";
$date->add($interval);
echo $date->format('c')."\n";
Expected result:
------------------
1970-01-01T00:00:00+00:00
1970-01-01T01:00:00+00:00
1970-01-01T02:00:00+00:00
Actual result:
----------------
1970-01-01T00:00:00+00:00
1970-01-01T02:00:00+00:00
1970-01-01T04:00:00+00:00
------------------------------------------------------------------------
[2013-05-03 10:30:56] rob dot norman at infinity-tracking dot com
I'm seeing similar behaviour across daylight boundaries with CentOS 5.9, PHP
5.4.13
Test script:
------------
$tzLon = new DateTimeZone( 'Europe/London' );
$tzUtc = new DateTimeZone( 'UTC' );
$interval = new DateInterval( 'PT24H' );
// Before change from GMT to BST.
$strDt = '2013-04-31 12:00:00';
// Adding the interval in UTC behaves as expected.
$dt = new DateTime( $strDt, $tzUtc );
$dt->add( $interval );
echo $dt->format( 'Y-m-d H:i:s' ) . "\n";
// Adding the interval in Europe/London does not.
$dt = new DateTime( $strDt, $tzLon );
$dt->add( $interval );
// Convert to UTC for comparison.
$dt->setTimeZone( $tzUtc );
echo $dt->format( 'Y-m-d H:i:s' ) . "\n";
Expected result:
----------------
2013-05-02 12:00:00
2013-05-02 12:00:00
Actual result:
--------------
2013-05-02 12:00:00
2013-05-02 11:00:00
------------------------------------------------------------------------
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https://bugs.php.net/bug.php?id=63311
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