I had kid cat all ready and packed for someone and I saved and quit and put my ac card in my other 3ds and the date went from January to August and kid cat is now gone :c why did it do this?
I could be wrong, but I have a feeling it might have something to do with the date registered on your 3DS (not the AC game). I remember reading threads where people were saying they used different methods to time travel in AC ( TT via 3DS date and TT via Animal Crossing date change ).