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<?php $dt = new \DateTime('2016-01-01'); $olderDt = (clone $dt)->sub(new \DateInterval('P1D')); print_r($dt); print_r($olderDt);
Output for git.master, git.master_jit, rfc.property-hooks
DateTime Object ( [date] => 2016-01-01 00:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Amsterdam ) DateTime Object ( [date] => 2015-12-31 00:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Amsterdam )

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