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<?php $dt = new DateTime('2021-11-25 16:46:15'); var_dump($dt->format('Y-m-d H:i:s')); $dt->setTimeZone(new DateTimeZone('+0100')); var_dump($dt->format('Y-m-d H:i:s')); $dt->setTimeZone(new DateTimeZone('-0600')); var_dump($dt->format('Y-m-d H:i:s')); $dt->setTimeZone(new DateTimeZone('UTC')); var_dump($dt->format('Y-m-d H:i:s'));
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(19) "2021-11-25 16:46:15" string(19) "2021-11-25 16:46:15" string(19) "2021-11-25 09:46:15" string(19) "2021-11-25 15:46:15"

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