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<?php $date = (new \DateTime('2018-07-03'))->modify('+21 days'); echo $date->format('d/m/Y').'\n'; var_dump($date);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
24/07/2018\nobject(DateTime)#1 (3) { ["date"]=> string(26) "2018-07-24 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 24/07/2018\nobject(DateTime)#1 (3) { ["date"]=> string(26) "2018-07-24 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.3.32 - 7.3.33, 8.0.13
24/07/2018\nobject(DateTime)#1 (3) { ["date"]=> string(26) "2018-07-24 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }

preferences:
156.07 ms | 401 KiB | 200 Q