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<?php var_dump((new \DateTime('+600 seconds'))->format(DateTime::ATOM));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 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 - 8.3.7
string(25) "2017-07-05T16:22:44+02:00"
Output for 7.3.32 - 7.3.33, 7.4.26, 8.0.13
string(25) "2017-07-05T14:22:44+00:00"

preferences:
147.38 ms | 401 KiB | 219 Q