Bug #77103 [NEW]: new DateTime('now') return incorrect timezone during DST transitions

From: tomas dot prochazka at gmail dot com Operating system: irrelevant PHP version: 7.2.11 Package: Date/time related Bug Type: Bug Bug description:new DateTime('now') return incorrect timezone during DST transitions Description: ------------ For timezone Europe/Prague should be DST changed at 2018-10-28 at 3 am back to 2 am. Until 3 am. it still should be CEST time, and after change it should be CET. So time between 2 and 3 is repeated two times, but in different timezone. When I'm using this code before 2 am in the transition day 2018-10-28 it works as expected: $d = DateTime('now') $d->format('Y-m-d H:i:s P T') => 2018-10-28 01:58:38 +02:00 CEST $d->$d->getOffset() => 7200 but few minutes later, after 2 am, the same code return 2018-10-28 02:00:04 +01:00 CET 3600 Which is not true, it still should be +02:00 CEST and 7200. After 2:39:59 it correctly return back to 2:00:00 and now already correctly with CET. So if you are logging data do some log file in the standardized format like $d->format(DateTime::ISO8601) you will get all times between 2 and 3 am twice the time with exactly the same time string. Which is really very wrong. I would not expect such bug in PHP. Luckily date('P, Z, I, T') works correctly It return "+02:00, 7200, 1, CEST" between 2 and 3 am before DST transition. I found that I can use this $d = new \Nette\Utils\DateTime(date('Y-m-d H:i:s T')); instead of 'now' and then it correctly return 2018-10-28 02:12:03 +02:00 CEST 7200 -- Edit bug report at https://bugs.php.net/bug.php?id=77103&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77103&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77103&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77103&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77103&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77103&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77103&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77103&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77103&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77103&r=support Expected behavior: https://bugs.php.net/fix.php?id=77103&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77103&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77103&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77103&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77103&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77103&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77103&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77103&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77103&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77103&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77103&r=mysqlcfg