Bug #53294 [NEW]: DateTime->setTimezone() very slow far future dates

From: Operating system: 64 bit Centos PHP version: 5.2.14 Package: Date/time related Bug Type: Bug Bug description:DateTime->setTimezone() very slow far future dates Description: ------------ DateTime->setTimezone() is very slow on dates in the far future (or history), and the time needed isnt monotonic for greater dates. ie. setTimezone() on a DateTime(PHP_INT_MAX) /* 64 bit max */ takes 0.05 seconds, but takes 250 whole seconds for PHP_INT_MAX/2 . Using the $timezone parameter of the DateTime constructor is always fast though. Test script: --------------- $start = microtime(1); $date = new DateTime('@'.(PHP_INT_MAX)); // $date = new DateTime('@'.(int)(PHP_INT_MAX / 2)); $date->setTimezone(new DateTimeZone('Europe/Amsterdam')); echo microtime(1) - $start; Expected result: ---------------- A faster change of the timezone; performance equal to using the constructor parameter -- Edit bug report at http://bugs.php.net/bug.php?id=53294&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=53294&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=53294&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=53294&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=53294&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=53294&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=53294&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=53294&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=53294&r=needscript Try newer version: http://bugs.php.net/fix.php?id=53294&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=53294&r=support Expected behavior: http://bugs.php.net/fix.php?id=53294&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=53294&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=53294&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=53294&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=53294&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=53294&r=dst IIS Stability: http://bugs.php.net/fix.php?id=53294&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=53294&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=53294&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=53294&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=53294&r=mysqlcfg