Bug #65811 [NEW]: Invalid hour returned on DST change

From: glavic at gmail dot com Operating system: ALL PHP version: Irrelevant Package: Date/time related Bug Type: Bug Bug description:Invalid hour returned on DST change Description: ------------ If I currently have datetime in DST, and then add some interval to that date (to skip DST), invalid datetime is returned. How it is: 2013-10-27 01:45 (in DST) + 30 min = 02:15 (not in DST) How it should be: 2013-10-27 01:45 (in DST) + 30 min = 01:15 (not in DST) Same for all php versions about >= 5.2.0 : http://3v4l.org/DUO06 Test script: --------------- $tz = new DateTimezone('Europe/Berlin'); # uses DST $dt = new DateTime('2013-10-27 01:45:00', $tz); echo $dt->format('Y-m-d H:i I') . "\n"; $dt->modify("+30 minute"); echo $dt->format('Y-m-d H:i I') . "\n"; Expected result: ---------------- 2013-10-27 01:45 1 2013-10-27 01:15 0 Actual result: -------------- 2013-10-27 01:45 1 2013-10-27 02:15 0 -- Edit bug report at https://bugs.php.net/bug.php?id=65811&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=65811&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=65811&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=65811&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=65811&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=65811&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=65811&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=65811&r=needscript Try newer version: https://bugs.php.net/fix.php?id=65811&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=65811&r=support Expected behavior: https://bugs.php.net/fix.php?id=65811&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=65811&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=65811&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=65811&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=65811&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=65811&r=dst IIS Stability: https://bugs.php.net/fix.php?id=65811&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=65811&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=65811&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=65811&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=65811&r=mysqlcfg