Country Life is a single player Half-Life 2 modification that aims to simulate the daily work of a farmer.
This is a screenshot of the real time day and night cycle. The little red box down the bottom of the image is in-game clock, showing it's currently 6:30 AM, and zero days into the season. The little field is full of weeds which can be picked up and thrown away, and just like in Harvest Moon will randomly respawn when a new day starts.