No, I change the time on my P's all the time to grind working for items and to make the sleeping patterns match mine so I can play for longer also change the date to meet the eco triplets sometimes but it seems to have a form of internal clock that counts the real hours as you can only change the date and meet the eco triplets once a day they don't appear again if you change the date again that same day and it also does not make the tamas evolve you still have to wait for the next day no matter how you change the time or date