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<?php $interval = new DateInterval('P3Y1D'); $dt = new DateTime('2012-05-05'); var_dump($dt); $dt->add($interval); var_dump($dt); $dt = new DateTime('2012-05-05'); $dt->sub($interval); var_dump($dt); $dt = new DateTime('2012-05-05'); $dt->modify('last day'); var_dump($dt); $dt->add($interval); var_dump($dt);

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