what landslide on earth is happening here? But question is who voted for Yes? 
The OP of course 
Tbh didn’t never pay much attention to whole day/night-cycle in-game.
Does the game have it?
Which one? Both TQ and GD have them, but TQ’s is more pronounced I’d say.
I personally only notice the day/night cycle at Broken Hills and similar areas.
That sounds pretty awesome. Would be cool to see this on at least a bunch of enemies at some point in the future (assuming that “engine support” = “all ready to be implemented with minimal effort”, which…it may not).
Also, No @ the poll.
Apart from being a ridiculous waste of dev-time, the game would also need to know your geographical location.
Actually it just needs to check your system time, but still, such a feature es much better suited for a mod.