Bug #64052 [Opn->Nab]: PHP DateTime Add and sub

Edit report at https://bugs.php.net/bug.php?id=64052&edit=1 ID: 64052 Updated by: derick@php.net Reported by: moses dot liao at techlinkz dot net Summary: PHP DateTime Add and sub -Status: Open +Status: Not a bug Type: Bug Package: Date/time related Operating System: Linux PHP Version: 5.3.21 Block user comment: N Private report: N New Comment: Please do not submit the same bug more than once. An existing bug report already describes this very problem. Even if you feel that your issue is somewhat different, the resolution is likely to be the same. Thank you for your interest in PHP. This has been filed so many times, and it's still not a bug. For a full explanation, see: http://derickrethans.nl/obtaining-the-next-month-in-php.html Previous Comments: ------------------------------------------------------------------------ [2013-01-23 03:07:22] moses dot liao at techlinkz dot net 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 this bug report at https://bugs.php.net/bug.php?id=64052&edit=1