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<?php $interval = new DateInterval('P1D'); $dt = new DateTime('first day of January 2011'); var_dump($dt); $dt->add($interval); var_dump($dt); $dt = new DateTime('first day of January 2011'); $dt->sub($interval); var_dump($dt);
Output for git.master, git.master_jit, rfc.property-hooks
object(DateTime)#2 (3) { ["date"]=> string(26) "2011-01-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#2 (3) { ["date"]=> string(26) "2011-01-02 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#3 (3) { ["date"]=> string(26) "2010-12-31 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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