calendar

monitor = peripheral.find("monitor")

--Alteravel
local time = 10 --Update
local interval = 8 --Intervalo de noites

--Nao mexer
local day = 0
local music = false
local next = os.day()

while true do

  if day ~= os.day() then
    day = os.day()

    if day >= next then
      next = next + 1
    end

    while next%interval ~= 0 do
      next = next + 1
    end

    if day%interval == 0 then
      if music == false then
        music = true
        monitor.setBackgroundColour(colors.red)
        rs.setOutput("bottom", true)
        sleep(1)
        rs.setOutput("bottom", false)
      end
    else
      monitor.setBackgroundColour(colors.green)
      music = false
    end

    monitor.clear()
    monitor.setTextScale(1)

    monitor.setCursorPos(1,1)
    monitor.setTextColour(colors.white)
    monitor.write("Hoje:")
    monitor.setCursorPos(1,2)
    monitor.write("dia " .. string.format("%i", day))

    monitor.setCursorPos(1,4)
    monitor.setTextColour(colors.black)
    monitor.write("Negada:")
    monitor.setCursorPos(1,5)
    monitor.write("dia " .. string.format("%i", next))
  end

  sleep(time)
end