3v4l.org

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<?php echo ("Expires: ".gmdate("D, d M Y H:i:s", time() + 3600)." GMT"); echo "\n"; $date = strtotime("+7 day"); echo date("l, d-M-Y H:i:s T", $date);
Output for 5.4.0 - 5.4.45, 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
Expires: Thu, 22 Oct 2015 12:11:00 GMT Thursday, 29-Oct-2015 13:11:00 CET

preferences:
123.61 ms | 402 KiB | 131 Q