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<?php for ($i = 1; $i <= 12; $i++) { $date = DateTime::createFromFormat('Y-m-d h:i:s', '2013-' . str_pad($i, '0', STR_PAD_LEFT) . '-29 00:00:00'); var_dump($date->format('Y-m-d'), $date->modify('+1 month')->format('Y-m-d')); echo "\n"; }

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