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<?php $a = new \DateTime('2016-03-13 2:00:00', new DateTimeZone('America/Los_Angeles')); $b = clone $a; $b->sub(new \DateInterval('PT2H')); print_r([$a,$b]);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => DateTime Object ( [date] => 2016-03-13 03:00:00.000000 [timezone_type] => 3 [timezone] => America/Los_Angeles ) [1] => DateTime Object ( [date] => 2016-03-13 00:00:00.000000 [timezone_type] => 3 [timezone] => America/Los_Angeles ) )

preferences:
151.12 ms | 404 KiB | 198 Q