Bug #69468 [NEW]: DateTime->add problem for 2015-01-31

From: pawaroti at gmail dot com Operating system: Windows 7 PHP version: 5.5.24RC1 Package: Date/time related Bug Type: Bug Bug description:DateTime->add problem for 2015-01-31 Description: ------------ Adding 1 month using DateInterval('P1M') sets date to 2015-03-03 if adding from DateTime('2015-01-31') +1 month = 2015-03-03 +2 months = 2015-03-31 +3 months = 2015-05-01 +4 months = 2015-05-31 +5 months = 2015-07-01 +6 months = 2015-07-31 +7 months = 2015-08-31 +8 months = 2015-10-01 +9 months = 2015-10-31 +10 months = 2015-12-01 +11 months = 2015-12-31 +12 months = 2016-01-31 BEFORE: object(DateTime)[5] public 'date' => string '2015-01-31 00:00:00.000000' (length=26) public 'timezone_type' => int 3 public 'timezone' => string 'Europe/Warsaw' (length=13) AFTER object(DateTime)[5] public 'date' => string '2015-03-03 00:00:00.000000' (length=26) public 'timezone_type' => int 3 public 'timezone' => string 'Europe/Warsaw' (length=13) INTERVAL object(DateInterval)[6] public 'y' => int 0 public 'm' => int 1 public 'd' => int 0 public 'h' => int 0 public 'i' => int 0 public 's' => int 0 public 'weekday' => int 0 public 'weekday_behavior' => int 0 public 'first_last_day_of' => int 0 public 'invert' => int 0 public 'days' => boolean false public 'special_type' => int 0 public 'special_amount' => int 0 public 'have_weekday_relative' => int 0 public 'have_special_relative' => int 0 Test script: --------------- for($i=0; $i<=12; $i++) { $data = new DateTime('2015-01-31'); echo $data->add(new DateInterval('P'.$i.'M'))->format('Y-m-d').'<br />'; } Expected result: ---------------- 2015-02-28 2015-03-31 2015-04-30 2015-05-31 2015-06-30 2015-07-31 2015-08-31 2015-09-30 2015-10-31 2015-11-30 2015-12-31 2016-01-31 Actual result: -------------- 2015-03-03 2015-03-31 2015-05-01 2015-05-31 2015-07-01 2015-07-31 2015-08-31 2015-10-01 2015-10-31 2015-12-01 2015-12-31 2016-01-31 -- Edit bug report at https://bugs.php.net/bug.php?id=69468&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=69468&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=69468&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=69468&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=69468&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=69468&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=69468&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=69468&r=needscript Try newer version: https://bugs.php.net/fix.php?id=69468&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=69468&r=support Expected behavior: https://bugs.php.net/fix.php?id=69468&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=69468&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=69468&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=69468&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=69468&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=69468&r=dst IIS Stability: https://bugs.php.net/fix.php?id=69468&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=69468&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=69468&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=69468&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=69468&r=mysqlcfg