Bug #66187 [NEW]: DateTime->add() incorrect on BST boundry

From: andrewpate08 at hotmail dot com Operating system: Linux/Windows XP PHP version: Irrelevant Package: Date/time related Bug Type: Bug Bug description:DateTime->add() incorrect on BST boundry Description: ------------ British summertime does not actually end until.... 27-10-2013 01:59:59+01:00 (BST) at which point, one second later it kicks back to GMT... 27-10-2013 01:00:00+00:00 (GMT) It seems calculations involving DateTime->add() and the 'Europe/London' DateTimeZone crossing the END of British summertime (BST) gives an incorrect result. On the day British summertime ends it is not until 2:00AM (BST) which is 1:00AM (GMT) that clocks switch from BST to GMT (i.e. go back from 2:00 to 1:00) Test script: --------------- <?php $start = new DateTime("2013-10-27 00:55:00", new DateTimeZone('Europe/London')); $step = DateInterval::createFromDateString("600 seconds"); echo "start = " . $start->format('d-m-Y H:i:sP') . "<br />"; $start->add($step); echo "start = " . $start->format('d-m-Y H:i:sP') . "<br />"; ?> Expected result: ---------------- start = 27-10-2013 00:55:00+01:00 start = 27-10-2013 01:05:00+00:00 Actual result: -------------- start = 27-10-2013 00:55:00+01:00 start = 27-10-2013 01:05:00+01:00 -- Edit bug report at https://bugs.php.net/bug.php?id=66187&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=66187&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=66187&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=66187&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=66187&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=66187&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=66187&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=66187&r=needscript Try newer version: https://bugs.php.net/fix.php?id=66187&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=66187&r=support Expected behavior: https://bugs.php.net/fix.php?id=66187&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=66187&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=66187&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=66187&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=66187&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=66187&r=dst IIS Stability: https://bugs.php.net/fix.php?id=66187&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=66187&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=66187&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=66187&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=66187&r=mysqlcfg