If the Earth is indeed flat, then how can it be nighttime in one area of the world and daytime in another area? When the sun sets where I live, there is another three hours of sunlight for where my friend lives!
Cut-and-paste from the FAQ, where I just added it:
Q: "What about time zones?"
A: Since the sun is a spot light, not all of the Flat Earth is lit at the same time (just like the Round Earth). Time zones exist on the Flat Earth for the same reason they do on the Round Earth: you want it to be approximately noon, locally, whenever the sun is at its zenith, locally.
-Erasmus