Day / Night
Some maps are clearly in the middle of the day while others are set at night. However, times like dawn and dusk may straddle the line between day and night that isn’t particularly clear where these maps may fall.
To answer this question for yourself, ask this: Is your map primarily lit by the sun, or by artificial lights? If daylight (direct or ambient) is the primary means by which your map is lit, then it’s daytime. If your map is primarily lit by artificial lights, then it’s night.
For example, while Granary uses lots of artificial lighting to brighten the map, this is only done in the shadows where the daylight doesn’t hit. The map is bright enough where the daylight alone hits, and therefore the map would be classified as daytime. If the sun was lower in the sky and casting less light, requiring everything to be lit artificially, then it would be classified as nighttime.\
If you want to build an entirely interior map with no visible sky, you do not need to fulfill the daytime/nighttime requirement, although it is not advisable to do so.