Now that I've played with the modding I can confirm that time is there. The Sun and Moon are also available (could probably use a bit of artistic touch up to make them crisper--but hey it is cosmetic.) The moon shows phases from what I can tell. It also seems to have some sort of star map built in. I clearly recognized Cassiopeia, the Great Square of Pegasus, Ursa Major, and some others and they appeared to be properly aligned for the time of year and night (just a rough check.) Night on the snow was not very dark, but that is realistic with starlight.

I also set the duration timer (appears to be in 3 minute increments.)

Glad to see these touches are indeed going to be in the full game!

Liked the info about ambushes and general's skill having some impact on success/failure (in a preview somewhere.)