From:             moses dot liao at techlinkz dot net
Operating system: Linux
PHP version:      5.3.21
Package:          Date/time related
Bug Type:         Bug
Bug description:PHP DateTime Add and sub

Description:
------------
Using the current datetime, adding and subtracting one month does not
result in an actual one month addition and subtraction

Test script:
---------------
        <td valign="top">
            <?php

            $previousMonth = new DateTime ('2013-03-31');
            $previousMonth->sub (new DateInterval ('P1M'));
            echo $previousMonth->format ('Y-m-d');

            ?>
        </td>

        <td valign="top">
            <?php

            $nextMonth = new DateTime ('2013-03-31');
            $nextMonth->add (new DateInterval ('P1M'));
            echo $nextMonth->format ('Y-m-d');

            ?>
        </td>


Expected result:
----------------
previous month to show 2013-02-*, next month to show 2013-04-*

Actual result:
--------------
<td>2013-03-03</td><td>2013-05-01</td>

-- 
Edit bug report at https://bugs.php.net/bug.php?id=64052&edit=1
-- 
Try a snapshot (PHP 5.4):   
https://bugs.php.net/fix.php?id=64052&r=trysnapshot54
Try a snapshot (PHP 5.3):   
https://bugs.php.net/fix.php?id=64052&r=trysnapshot53
Try a snapshot (trunk):     
https://bugs.php.net/fix.php?id=64052&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=64052&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=64052&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=64052&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=64052&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=64052&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=64052&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=64052&r=notwrong
Not enough info:            
https://bugs.php.net/fix.php?id=64052&r=notenoughinfo
Submitted twice:            
https://bugs.php.net/fix.php?id=64052&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=64052&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64052&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=64052&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=64052&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=64052&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=64052&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=64052&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=64052&r=mysqlcfg

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