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@ 2018-07-03T13:41:56Z

<?php

$date = (new \DateTime('2018-07-03'))->modify('+21 days');
echo $date->format('d/m/Y')."\n";


$date = (new \DateTime('2018-07-03'))->add(new \DateInterval('P21D'));
echo $date->format('d/m/Y')."\n";

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Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.26, 7.4.0 - 7.4.14, 8.0.0 - 8.0.2: 24/07/2018 24/07/2018