Online PHP editor | refs for 3pbah

<?php ini_set('date.timezone', 'GMT'); // Sun, 06 Nov 1994 08:49:37 GMT $date = gmmktime(8, 49, 37, 11, 6, 1994); function compare_date_format($date, $constant, $string) { $constant_date = date((defined($constant)) ? constant($constant) : '', $date); $string_date = date($string, $date); var_dump($constant, $constant_date, $string_date, $constant_date === $string_date); } compare_date_format($date, 'DATE_RFC822', 'D, j M y H:i:s O'); compare_date_format($date, 'DATE_RFC850', 'l, d-M-y H:i:s T'); compare_date_format($date, 'DATE_RFC1036', 'D, d M y H:i:s O'); compare_date_format($date, 'DATE_RFC1123', 'D, d M Y H:i:s O'); compare_date_format($date, 'DATE_RFC2109', 'D, d-M-y H:i:s T'); compare_date_format($date, 'DATE_COOKIE', 'D, d-M-Y H:i:s T'); compare_date_format($date, 'DATE_RFC2616', 'D, d M Y H:i:s \G\M\T'); //compare_date_format($date, 'DATE_RFC2965', ''); compare_date_format($date, 'DATE_RFC2822', 'D, j M Y H:i:s O'); compare_date_format($date, 'DATE_RFC5322', 'D, j M Y H:i:s O'); compare_date_format($date, 'DATE_RFC6265', 'D, d M Y H:i:s \G\M\T'); compare_date_format($date, 'DATE_RFC7231', 'D, d M Y H:i:s \G\M\T');