Redstone lamp timer

Hey!
I just need a plugin that will make all redstone lamps placed in the "on state" with a timer going toward there "off state"

Every 12 hours all redstone lamps will go in the "off state"

They will all go into the "on state" via the command: /poweron
Resetting the timer, so on so fourth.

I would also like a command such as: /powertime
to show the remaining time of the redstone lamps going into there "off state"

Example.
When the command "/poweron" is used, all lamps in the world will be in there "on state" (lit/on)
After 12 hours, all the lamps will be shut off (off/unlit)
Using the command "/poweron" will reset the time, continuing its cycle.

If I wish to check the time until the power is out. I use the command "/powertime" showing the remaining time.

If all the lamps are off and I use the command "/powertime" it will reply saying "The power is out!"

Thanks in advance

 

This sounds like something that can be solved with daylight sensors.

 

Doesn't have the commands I would like. And this would require a lot of time to-do since there are over 3,000 lamps on my server.

 

What would happen when the server restarts?

 

They all go in there "off state"

Are you developing this? @Signatured

EDIT by Timtower: merged posts

 

If I have time, maybe. @KureLK