3v4l.org

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<?php echo mktime(0,0,0, date("n"), date("j", strtotime(date("Y-m-d") . " + 1 day")), date("Y")) - time(); ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.2 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.25, 7.3.0 - 7.3.12, 7.4.0
84303
Output for 5.1.0 - 5.1.1
-174897

preferences:
141.87 ms | 401 KiB | 243 Q