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<?php $dt = new DateTime('2022-01-31 14:00:00'); if($dt->format('d') == $dt->format('t')){ $dt->modify('last Day of next month'); } //test output echo $dt->format('Y-m-d H:i:s')."\n";
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
2022-02-28 14:00:00

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30.37 ms | 1137 KiB | 7 Q