ComputerCraft Clock

--Works best with 5x5 or 4x4 monitors--

print("12-Hour-System? (Y/N)")
hour = read()
print("")
print("Monitorheight: ")
height = tonumber(read())
print("")
print("Monitorlength: ")
length = tonumber(read())
print("")
print("Clock is running")



local monitor = peripheral.wrap("back")

monitor.setTextScale(5)

while true do
    local decimalTime = os.time()
    local hours = math.floor(decimalTime)
    local minutes = math.floor((decimalTime - hours) * 100 * 0.6)
    local ampm = "PM"

    if hour == "Y" then
        if hours > 12 then
            hours = hours - 12
            ampm = "PM"
        else
            ampm = "AM"
        end
    else
        ampm = ""
    end

    monitor.clear()
    monitor.setCursorPos(length - 1.5,height - 1)
    if minutes < 10 then
        monitor.write(hours..":0"..minutes.." "..ampm)
    else
        monitor.write(hours..":"..minutes.." "..ampm)
    end
    sleep(2)
end