Clock

    mon = peripheral.wrap("right") -- replace "left" with the side your monitor is on
    mon.setTextScale(5) -- change 5 to any any number between 0.5 and 5 to change the size of the text
    while true do
         mon.clear()
         mon.setCursorPos(1,1)
         local nTime = os.time()
         mon.write(os.day() .. "d" .. " " .. textutils.formatTime(nTime,false) .. "h")
         sleep(1)
    end