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<?php $start = new DateTimeImmutable('2018-10-23 00:00:00'); $datetime = $start->modify('+20 hours +20 minutes'); var_dump($start->format('Y-m-d H:i:s')); var_dump($datetime->format('Y-m-d H:i:s'));
Output for 5.6.38, 7.1.0 - 7.1.24, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
string(19) "2018-10-23 00:00:00" string(19) "2018-10-23 20:20:00"

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