Is there any way to tell what time it is?

The reason I ask is because at nighttime, it's pitch black. I don't like using night vision very much as it can be too bright if you accidentally look at lights.

Can you check what time it is in the game? I'd rather start and do certain missions in the light of day so that I'm not restricted to just night vision.

Yes, apparently there is a way to see the in-game time, though it is relatively obscured. From this Reddit PSA:

I found today that there is a clock. If you look through your binoculars on the right hand side of the screen in the middle there is a clock right above what province you are in.

Also if you just view the map (I suppose this may be a new feature), it states what in-game time it is under your player's info on the top right.