The virtual world itself has a rising sun. It rises, and sets, according to its own internal calculations. This clock reflects the position of the sun and moon in-game.
In events and scenarios it's been used to good effect for timing takeoffs at dawn, etc. In the MAs it's faster than normal time so that the sun may rise and set in a couple of hours (or whatever. I don't know what rate it's at).
It's not your local time, it's just "in this virtual world, this is the time"
