I have not hacked Pokemon, or even played, in a while but I remember hearing something about being able to tell if a Pokemon was hacked based on the IV spread and the date it was caught. I paid too much attention to RNGing, only did it for a few shiny eggs, but apparently the date has an affect on what you encounter.
So, for hacked Pokemon that are listed as "bred" (or I suppose any Pokemon in general..), does the date matter? Will it be possible to tell a Pokemon is hacked when comparing the IV spread with when it captured/hatched/picked up?