DON'T EVER RESTART YOUR COMPUTER OR SHUT IT OFF IN THE MIDDLE OF THE GAME!

Sorry for yelling, but NEVER, EVER do that.

1. Your world will most likely become corrupted resulting in a reset to day 1. We then have to deal here with all the people that tried your recommendation and now have absolutely no clue on how to restore their world.

2. Even worse, your Windows installation might become corrupted (less likely, still a chance), and then your computer might not even start anymore.

So, please, either delete your post, or amend it that there's a HUGE risk of destroying your world.

That said: If you haven't been preparing and bringing a portal with you (IMHO you then shouldn't be save scumming and instead be man/woman enough to pay the price), since the latest patch you can easily restore your world two hours (at worst) before you last logged off.