It would be nice to know the specific time of launch on May 8. If it is at 9:01A.M. CET(Oslo) time, it will be 12:01A.M in California and 7:01 P.M. in Melborne, all on May 8.
Usually it’s an ‘unlock’ time. The game is all ready to go, just needs to be activated at the network. This will likely be at 12:01AM GMT. But this is just a guess. GMT is often used as the main timezone for releases.