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<?php $date = new DateTime('2013-01-01'); $date2 = clone $date; $date2->modify("+1 month +3 day"); // add 34 days var_dump($date->diff($date2)->format("%a")); // Expected 34 days $date2->modify("+1 month +3 day"); // add 34 days var_dump($date->diff($date2)->format("%a")); // Expedted 68 , recived 65

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