I want to put that a raid can be done from 18:30 to 00:00.
After 00:00 a raid cannot be done until 18:30.

How do I do that, which plugin do I need to have?

Simplest way I can think of is something like this

https://umod.org/plugins/no-raid

and timed executables.

https://umod.org/plugins/timed-execute

Simply load and unload the plugin using timed executables at the times you require.

"EnableInGameTime-Timer": true,
"EnableRealTime-Timer": false,
"EnableTimerOnce": false,
"EnableTimerRepeat": false,
"InGameTime-Timer": {
"18:30": "oxide.unload NoRaid",
"00:00": "oxide.load NoRaid"

Who knows if that would work. There should be one plugin for that.

why wouldn't it work ?

There is probably another way. If anyone knows please write.

Merged post

Does anyone know more?

Sometimes you need to combine plugins in order to make ideas alive. But sometimes  there are plugins - idea ready and you can use them but some of them are paid. Anyways this idea from nashslash works great just you have cons like... People need to know raid times form discord or you need to add another plugin or command with info so people can check the raid time. Not sure how NoRaid works but if simply prevents damage your "Stupid" players... yeah player is stupid and do not read shit then complain so your stupid players will waste C4 or other boom then cry... I wasn't able to raid and wasted booms pls give my stuff back. So in this case might be bad but still pretty good solution for free. If you want go check yourself CRaidController plugin in google, because I am not able to link other websites in here but this plugin can sow GUI on your screen for raidtimes and auto enable disable raiding by hours/days etc...

Hope my reply helped you...