There WOULD still be time-zones in a flat earth model because the sun would go around the "paper world" and everything would be night for a LONG ass time but the ground would glow 'cause the sun is under us then there wouldn't be a need for night lights. And tree's n shit would grow faster because the sun is directly under them so they get alot of solar energy to grow and Orthro stocks would rise because of the gardening consumer's demand for Weed-B-Gone.