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<?php function lastWeekDay ($mnt) { $result = strtotime("last day of $mnt"); $day = date('D', $result); if ('Sun' === $day) { $result -= 86400 * 2; } if ('Sat' === $day) { $result -= 86400; } return $result; } echo date("Y-m-d", strtotime("2011-W17-6"));

preferences:
35.85 ms | 402 KiB | 5 Q