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In the "Upheaval" expansion - passage of time (daylight and darkness cycle) can be tracked through the sundial ring in the mini-map. The golden color represent daylight and the blue darkness.
Current game time is marked by "compass north" on the sundial - a period text description is also displayed.
In the first dial, the game time is "dusk", the 2nd dial shows "noon".
Certain NPCs will light up their lanterns during the night.
Contrast of light and darkness.
"A game is fun if it is learnable but not trivial" -- Togelius & Schmidhuber