Bug #71855 [NEW]: setTimezone() doesn't work sometimes

From: youwishspambot at example dot orgy Operating system: PHP version: 7.0.4 Package: Date/time related Bug Type: Bug Bug description:setTimezone() doesn't work sometimes Description: ------------ https://3v4l.org/7CmJA please fix. ktnxbai :P Test script: --------------- <?php date_default_timezone_set('UTC'); $date = new DateTime('2015-01-01T12:00:00-05:00'); $timezone = $date->getTimezone(); echo $date->format('H:i'); // 12:00 echo "\n"; $date->setTimezone(new DateTimeZone('UTC')); echo $date->format('H:i'); // 17:00 echo "\n"; $date->setTimezone($timezone); echo $date->format('H:i'); // 12:00 echo "\n"; $date->setTimezone(new DateTimeZone('UTC')); echo $date->format('H:i'); // 12:00 ??? echo "\n"; -- Edit bug report at https://bugs.php.net/bug.php?id=71855&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71855&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71855&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71855&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71855&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71855&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71855&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71855&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71855&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71855&r=support Expected behavior: https://bugs.php.net/fix.php?id=71855&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71855&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71855&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71855&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71855&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71855&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71855&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71855&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71855&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71855&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71855&r=mysqlcfg