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<?php $d = new DateTime('@1539691200'); $d->setTimezone(new DateTimeZone('UTC')); var_dump($d);
Output for 5.6.38, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
object(DateTime)#1 (3) { ["date"]=> string(26) "2018-10-16 12:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

preferences:
148.97 ms | 408 KiB | 5 Q