CC 1.46 Analog Clock

local args = {...}

local handLength = args[1] or 15

local function round(n)
  return math.floor(n + 1)
end

local function setColor(color)
  if term.isColor() then
    term.setTextColor(color)
  end
end

local function drawClock()
  local w,h = term.getSize()
  local cx, cy = w/2, h/2

  term.clear()

  local setPos = term.setCursorPos
  for i=1, 12 do
    local x,y =
    math.sin(i/12 * math.pi*2)*handLength,
    -math.cos(i/12 * math.pi*2)*handLength * (4/7)

    setPos(round(cx + x),round(cy + y))
    setColor(colors.lightBlue)
    write(i)
  end

  setPos(cx + 1, cy + 1)
  setColor(colors.white)
  write '*'

  local function drawHand(r)
    local char = '.'
    for i=2, round(handLength/3), 2 do
      local x,y =
      math.sin(r * math.pi*2)*i,
      -math.cos(r * math.pi*2)*i

      setPos(round(cx + x), round(cy + y))
      write(char)
    end
  end

  local hours = os.time()
  local minutes = hours%2

  setColor(colors.lime)
  drawHand(hours*2/24)
  setColor(colors.magenta)
  drawHand(minutes/2)

  setPos(w-5, h)
  if hours >= 0 and hours < 12 then
    setColor(colors.orange)
    write 'AM'
    setColor(colors.gray)
    write '/PM'
  else
    setColor(colors.gray)
    write 'AM/'
    setColor(colors.lightBlue)
    write 'PM'
  end
end

while true do
  drawClock()
  sleep(0.05)
end