#50916 [NEW]: DateTime::sub repeats each time getTimestamp is called

From: Date: Tue, 02 Feb 2010 18:04:23 +0000
Subject: #50916 [NEW]: DateTime::sub repeats each time getTimestamp is called
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-147161@lists.php.net to get a copy of this message 
From:             charlesb at itsmystuff dot com
Operating system: Windows Server 2003 SP2
PHP version:      5.3.1
PHP Bug Type:     Date/time related
Bug description:  DateTime::sub repeats each time getTimestamp is called

Description:
------------
Each time DateTime::getTimestamp is called, a previously called
DateTime::sub value is applied.  This does not occur with DateTime::add.

Reproduce code:
---------------
$work_time = new DateTime("2010-01-30 12:00:00"); 
$work_time->sub(new DateInterval("P7D"));
$window_start = $work_time->getTimestamp();
echo date("Y-m-d H:i:s", $window_start) . "<br />";
$window_start = $work_time->getTimestamp();
echo date("Y-m-d H:i:s", $window_start) . "<br />";

Expected result:
----------------
2010-01-23 12:00:00
2010-01-23 12:00:00

Actual result:
--------------
2010-01-16 12:00:00
2010-01-09 12:00:00

-- 
Edit bug report at http://bugs.php.net/?id=50916&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=50916&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=50916&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=50916&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=50916&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=50916&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=50916&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=50916&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=50916&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=50916&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=50916&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=50916&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=50916&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=50916&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=50916&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=50916&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=50916&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=50916&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=50916&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=50916&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=50916&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=50916&r=mysqlcfg

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