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Bug #47271 Datetime::Modify
Submitted: 2009-02-02 09:58 UTC Modified: 2009-02-02 10:23 UTC
From: mguichar at univ-lr dot fr Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.2.8 OS: Windows / Linux
Private report: No CVE-ID: None
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From: mguichar at univ-lr dot fr
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 [2009-02-02 09:58 UTC] mguichar at univ-lr dot fr 
Description:
------------
When I add 1 hour to Datetime Object (using modify function), it's not 1 hour but 2 hour which are added. This bug appear only for date : 2001-03-25 01:03:00 / 2002-03-31 01:03:00 / 2003-03-30 01:03:00 / 2004-03-28 01:03:00 / 2005-03-27 01:03:00 / 2006-03-26 01:03:00 / 2007-03-25 01:03:00 / 2008-03-30 01:03:00

Reproduce code:
---------------
$date= date_create('2001-03-25 01:03:00');
echo $date->format("Y-m-d H:m:s")." +1 hour =>\n";
$date->modify("+1 hour");
echo $date->format("Y-m-d H:m:s")."\n\n";

$date= date_create('2002-03-31 01:03:00');
echo $date->format("Y-m-d H:m:s")." +1 hour =>\n";
$date->modify("+1 hour");
echo $date->format("Y-m-d H:m:s")."\n\n";

...

Expected result:
----------------
2001-03-25 01:03:00 +1 hour =>
2001-03-25 02:03:00

2002-03-31 01:03:00 +1 hour =>
2002-03-31 02:03:00

...

Actual result:
--------------
2001-03-25 01:03:00 +1 hour =>
2001-03-25 03:03:00

2002-03-31 01:03:00 +1 hour =>
2002-03-31 03:03:00

...

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 [2009-02-02 10:06 UTC] mguichar at univ-lr dot fr 
Same bug with date :
1998/03/29
1999/03/28
2000/03/26
and probably for each year before 1998 !
 [2009-02-02 10:20 UTC] mguichar at univ-lr dot fr 
Error come from default timezone ...
 
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