Time p***** differently...

I don't know if this has been brought up before, but could time move
alternately faster then slower on the island, so that if you're on the
island, you don't notice a difference, if you're measuring something
on and then off the island in a relatively small timeframe, you notice
a difference, but over the long run, it "evens out".

That would explain the 31 second difference with the rocket, nearly a
day for the helicopter, but it's still xmas 2004 both on and off the
island.