Its been a few months...

[Hulaette]

So I have not even touched my ACNL game since early summer this year. I want to load up my game and check out if there is any new DLC but I forgot what day I last played. If I load my game I'm sure some of my dreamies will have moved out by now. Will time traveling back a year count as 1 day?

 

[Reineke]

As long as you time travel back before you stopped playing, you'll be fine. I recently did this myself, heh. And yeah, I believe it counts as 1 day. With the exception of tree/bush growth, of course!