"I believe permit times are generated based upon the last digit of SSN, or some wacky system like that. Or it could be totally random. Anyway, what does it matter? It is when it is! If you start wondering about the how and why of the way the navy does things now, you are in for an extremely long four years + career!"
I heard it was based off SSN too right before I came in, but there isn't really anything to prove it as far as I have seen. It doesn't have to do with distance, either; I'm a MD resident and I had a super early report time, but some of my friends from the West Coast had the same time.
Just get there early and ready to go.