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<?php $date = new \DateTime('2018-10-31'); $date->modify('+60 days'); var_dump($date->format('Y-m-d')); $date2 = new \DateTime('2018-10-31'); $date2->modify('+1 month'); var_dump($date2->format('Y-m-d')); $date2->modify('+1 month'); var_dump($date2->format('Y-m-d'));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(10) "2018-12-30" string(10) "2018-12-01" string(10) "2019-01-01"

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