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<?php echo DateTime::createFromFormat('d/m/Y', '01/04/2018')->modify('+5 days')->format('d/m/Y');
Output for 7.1.25, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
06/04/2018

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93.8 ms | 1380 KiB | 4 Q