Bug #71511 [NEW]: Diff for februari not a month

From: efrkool at live dot nl Operating system: CentOS Linux release 7.2.1511 (C PHP version: 5.6.17 Package: Date/time related Bug Type: Bug Bug description:Diff for februari not a month Description: ------------ When calculating the number of months between the 1st of februari and the 1st of march I espect it to return 1 month but it returns 0. I first tought this had to do with the leap year but that doesn't have anything to do with it becouse it also happens for 2015. Test script: --------------- <?php $first = new \DateTime('2016-02-01 00:00:00', new \DateTimeZone('Europe/Amsterdam')); $second = new \DateTime('2016-03-01 00:00:00', new \DateTimeZone('Europe/Amsterdam')); $diff = $first->diff($second); echo $diff->format('%m') . PHP_EOL; // Expect: 1, got 0 $second->modify('+1 month'); $diff2 = $first->diff($second); echo $diff2->format('%m') . PHP_EOL; // Expect: 2, got 2 -- Edit bug report at https://bugs.php.net/bug.php?id=71511&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71511&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71511&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71511&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71511&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71511&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71511&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71511&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71511&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71511&r=support Expected behavior: https://bugs.php.net/fix.php?id=71511&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71511&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71511&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71511&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71511&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71511&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71511&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71511&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71511&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71511&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71511&r=mysqlcfg