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<?php echo strtotime(date('Y-m-d h:i:s', strtotime('-1 hours'))); echo " ||| "; echo strtotime(date('Y-m-d h:i:s', strtotime('-3 hours')));
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
1447932836 ||| 1447925636

preferences:
185.07 ms | 404 KiB | 221 Q