The game world does include a day and night cycle in which a variety of missions and daily deals on vehicles and equipment cycle through during the week. (gamingnexus.com)
Be consistent with your day - night cycles as well as your feeding schedule, and this will eliminate many unwanted behaviors. (nehumanesociety.org)
The area even features a day and night cycle which affects the difficulty level of the enemies found there. (squarexo.co.uk)