Bug #54145 [Com]: DateTime->add is not affected by DST changes
Edit report at http://bugs.php.net/bug.php?id=54145&edit=1
ID: 54145
Comment by: giorgio dot liscio at email dot it
Reported by: giorgio dot liscio at email dot it
Summary: DateTime->add is not affected by DST changes
Status: Bogus
Type: Bug
Package: Date/time related
Operating System: all?
PHP Version: 5.3.5
Block user comment: N
Private report: N
New Comment:
ok, this is right, now I understand
thank you, i'm sorry for bogus!
Previous Comments:
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[2011-03-03 15:31:57] derick@php.net
The time is not supposed to update. One month is a month, not 31 (or 30)
* 86400 seconds. You will also see that "P1D" adds one to the day, and
does not bother with the hours. A day at the DST change over is simply
25 hours (or 23 hours).
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[2011-03-03 15:23:59] giorgio dot liscio at email dot it
here is it
with your testcase, using time too in the constructor, the time itself
is not update
date_default_timezone_set('America/Chicago');
$d = new \DateTime('03-march-2011 10:10:10');
var_dump($d->format('c'));
$d->add(new \DateInterval('P1M'));
var_dump($d->format('c'));
date_default_timezone_set('Europe/Rome');
$d = new \DateTime('03-march-2011 10:10:10');
var_dump($d->format('c'));
$d->add(new \DateInterval('P1M'));
var_dump($d->format('c'));
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[2011-03-03 15:05:18] giorgio dot liscio at email dot it
so what? in your code this is working, right?
in this case i will investigate on the mine
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[2011-03-03 05:28:52] dtajchreber@php.net
david@copenhagen:~/test$ php -v
PHP 5.3.6-dev (cli) (built: Feb 26 2011 23:29:38) (DEBUG)
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies
david@copenhagen:~/test$ cat t.php
<?php
date_default_timezone_set('America/Chicago');
$d = new DateTime('03-march-2011');
var_dump($d->format('c'));
$d->add(new DateInterval('P1M'));
var_dump($d->format('c'));
date_default_timezone_set('Europe/Rome');
$d = new DateTime('03-march-2011');
var_dump($d->format('c'));
$d->add(new DateInterval('P1M'));
var_dump($d->format('c'));
david@copenhagen:~/test$ php t.php
string(25) "2011-03-03T00:00:00-06:00"
string(25) "2011-04-03T00:00:00-05:00"
string(25) "2011-03-03T00:00:00+01:00"
string(25) "2011-04-03T00:00:00+02:00"
david@copenhagen:~/test$
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[2011-03-03 02:03:27] giorgio dot liscio at email dot it
proposed solution:
->add and ->sub methods should internally convert to UTC before add or
sub the interval, then should re-set the original timezone
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