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<?php $dateTime = new DateTimeImmutable('now', new DateTimeZone('GMT+10:00')); var_dump($dateTime->format('c')); var_dump($dateTime->getTimestamp()); var_dump(time()); $dateTime = $dateTime->setTime(14, 0)->modify('- 10 days'); var_dump($dateTime->format('c')); var_dump($dateTime->getTimestamp());
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1
string(25) "2018-06-26T18:23:13+10:00" int(1530001393) int(1530001393) string(25) "2018-06-16T14:00:00+10:00" int(1529121600)

preferences:
124.51 ms | 403 KiB | 157 Q