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<?php $tz = new \DateTimeZone('Europe/Moscow'); $dt = new \DateTimeImmutable('now'); $dt = $dt->setTimezone($tz); $timestamp = $dt->format('U'); $timestamp += 1000; $dt2 = \DateTimeImmutable::createFromFormat('U', $timestamp, $tz); assert($dt->getTimezone() === $dt2->getTimezone());
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught AssertionError: assert($dt->getTimezone() === $dt2->getTimezone()) in /in/XBYr5:10 Stack trace: #0 /in/XBYr5(10): assert(false, 'assert($dt->get...') #1 {main} thrown in /in/XBYr5 on line 10
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: assert(): assert($dt->getTimezone() === $dt2->getTimezone()) failed in /in/XBYr5 on line 10
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Warning: assert(): Assertion failed in /in/XBYr5 on line 10
Output for 5.4.0 - 5.4.45
Fatal error: Class 'DateTimeImmutable' not found in /in/XBYr5 on line 4
Process exited with code 255.

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