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<?php $a = new \DateTime('2016-03-13 2:00:00', new DateTimeZone('America/Los_Angeles')); $b = clone $a; $b->sub(new \DateInterval('PT1S')); print_r([$a,$b]);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
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 03:59:59.000000 [timezone_type] => 3 [timezone] => America/Los_Angeles ) )