"IHGM is a mod for Minecraft 1.17.x that does one simple thing for server owners. Whenever there's no players online, IHGM will attempt, in a very
hacky simple way, to pause overworld's daytime ticks.
This basically means that when no one is online, time won't progress, meaning on small 24/7 servers, the days (and potentially difficulty) won't skyrocket. This is absolutely great for survival Minecraft servers with small player counts and mixed activity."