You just imort it in your world and done! It really simple but useful!

you can make it always: day, night, sunset, sunrise, or fatsday!

Fastday is that the cyclus is 30 times fatser! it's really cool!

You can aply it with /function and than "day" "night" "sunset" "sunrise" "fatsday" and remove it with "remove"

I have more like: 

   1. Dead Walk 

   2. Dead Look 

   3. Speedrun 

And in the feature: 

   1. One color kills you 

   2. Random effect 

   3. ... 

This script is really good for servers! And easy to use!
This script doesn't have a player.json so can be combined with others!