I believe there is some sort of "clock" or battery in the DS cart itself. Otherwise, it's in the programming. I too have tried to "change the time" to make the day a different time, but that doesnt seem to affect day events ingame.
★ Theme features 陳琳 from 痞子英雄 played by
→ 陳意涵 (Ivy Chen), who is just ♥ awesome ♥
→ Paired with May~ <3
→I'm currently studying at university and so
I have more or less left PC and probably
won't be back much if ever at all.
→Formerly Misaka Mikoto and Saya★eternity