3v4l.org

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<?php echo date("Y-m-d H:i:s", strtotime("last day of 2017-07 midnight"));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
2017-07-31 00:00:00

preferences:
163.88 ms | 403 KiB | 199 Q