Universal arena time - why would you want anything else?
P1:  Hey, hit that hangar at 22:15...
P2:  But it's 01:15 here...
P1:  No it isn't, my clock says 22:00 - you have 15 minutes to get there...
P3:  Wait, it's 03:45 here because our time zones are 30 minutes wide...
P2:  WTF time is it in the arena?
P3:  It's 14:25, but they've got the arena clock running x2 speed...