Yes, you can set the activity for different times of the day, but this function is pretty crude. For example, by setting the speed of the zombies to maximum and setting the night zombies, your zeds will get slow during the day and very fast at night, there is no fine tuning of the speed. For example, I would like to see zombies during the day with a normal movement speed, but less tenacious, and at night so that they run a little slower than through "shift" and have a large supply of health and increased strength.