Survival Mode. Biters only attack at night, regardless of pollution levels, and come in waves. Survive for as long as you can.
Large total conversion mods.
Is there an issue where the Day/Night cycle gets stuck?
It goes to 0:00 on my map and stops.
/c game.player.surface.freeze_daytime(FALSE)
Will make it continue.
It should only be freezing during night time while there are still enemies out in the map. Once all the enemies in the round have been killed, it should resume at day time. I'll take a look and see if I can figure out what's going wrong on yours.