If you alter the game clock forward, weeds grow in the town, animals get mad that you havent talked to them in awhile, and there are cockroaches all around in your house everywhere (since its kind of like travelling into the future). its kind of cheating, and i did it and i deeply regret it now. i had to unfortunately start my game since my stomach was queasy from all the weeds.
if you set it backwards, you get to replay events, but you might as well keep it on that time cycle, or else future things will occur when you readjust the clock. (see above ^)
i love this game, though i dont play it too much anymore, sadly. i like making clothes, getting free things, and getting new furni and wallpaper for my house.