I'm pretty new to Multi-User Dungeons so i'm not sure this question makes sense. It seems like every MUD engine i've seen that mentions a day/night cycle makes no mention of localized time, or it being day in one part of a large world and night in another part at the same time.

I'm considering trying to make my own MUD, and this (along with localized weather) is something i'd want it to have. If no engine supports this, how hard should i expect it to be to make this work in an existing engine?

Is there anything else i should know, since i currently don't have much experience in anything more complicated than Inform6?