Time travelling will RUIN your game. I learned this the hard way. I had to restart my game FIVE times before I realized that my villagers could NOT survive the rigors of time travel. I was CONSTANTLY in a food crisis and lots of other problems. I read the post that Bajantara listed above and though that maybe I should try doing it without time travelling. It took a long time, but I "beat" the game on the first try after that. I NEVER had a food crisis and everything ran smoothly. As someone who has done it both ways, it is actually much more fun without travelling. Besides, who wants to pay $19.99 for a game that is over in a day? I highly reccomend being patient, it is a much more pleasant experience that way.
ACC