Online PHP editor | refs for eipbv

<?php date(DateTime::RFC2822); // string(31) "Tue, 14 Jan 2014 19:21:18 +0100" gmdate('D, d M Y H:i:s'); // string(25) "Tue, 14 Jan 2014 18:21:18" header('Last-Modified: ' . date(DateTime::RFC2822)); // First method to set `Last-Modified` header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT'); // Second method to set `Last-Modified`