I haven't played ACNL for about week or so, if I time travel to the date I stopped playing or a few days before, will I still be at risk of my Dreamies moving out?
I read that someone lost a dreamie when the TT'd back to the right date, but when you go back in time, it only counts as a day, and it didn't happen to me so I don't think so
No, since time travelling back counts as only one day. I'd recommend that you use the 3DS clock for that rather than Isabelle, though. You can be at risk of losing your dreamies when you come back to the present, but to prevent that, you can deny someone's request to move before setting the date right to normal.
It does depend on how long of an absense you have had and where that Dreamie stood in terms of "moving" wise before your leave. I have once stopped playing for about two weeks and was lucky enough to have nobody move, but unfortuantley, the next time I had did this, I was upset to find that Whitney had moved out on me unexpedetl. While TTing does only equal an approx. 1 day no matter how far or foward you TT, that one day still could be the determing factor as to if they will mvoe or not.
Now, if your dreamies are still there and no one seems to be in "move" mode and you TT back to the date you stoppe, then it should be okay. I am just not sure as to whether as of now you have checked your dreamies for about that week of absence or if you didn't. If no one is moving, then you should be good to move to the original date.