As an Administrator how can I make the whole messageboard Auto detect the time in each members time zone?
I don't think this is doable unless all your members are from the same time zone; in which case, setting the global offset from Admin/Configuration/Features and Options/Overall Time Offset would be the better way of doing it. My two cents. :)
You can't. You can set the board wide time offset which is normally set to the time zone of the locality of the board owner and then each member can set their offset in their profile. Feel free to search the Mod Site (http://custom.simplemachines.org/mods/index.php) as there are some mods concerning timezones.