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<?php var_dump(datetime::createFromFormat('!U H', '3600 01')->getTimestamp());
Output for 5.6.38 - 5.6.40, 7.0.33, 7.1.0 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.9, 8.0.0alpha1 - beta1
int(7200)