If you come across the following error after inportming phpbb 3 to mybb its
usually caused by the birthday date field data being incompatible from you phpbb migration.
Warning  mktime() expects parameter 4 to be long, string given – Line: 1474 – File: member.php PHP 5.2.14 (Linux)
Open PHP MyAdmin – (MySql Admin Tool)
Select you database and run the following command