CraftOs 1.6 Clock from YT (comments "--" must be deleted)

local time = os.time()
local day = os.day()
local year = day/365
local dayfinal = day % 365
-- set "bottom" to whatever side you want the monitor attached to (remember don't type this in it's just tips :P)
monitor01 = peripheral.wrap("bottom")
--set v this v to whetever you want 3.4 is nice for a 1 tall by 4 long monitor setup
monitor01.setTextScale(3.4)

while true do
    monitor01.clear()
    monitor01.setCursorPos(12,1)
    time = os.time()
    day = os.day()
    monitor01.write(textutils.formatTime(time))
    monitor01.setCursorPos(8,2)
    monitor01.write("Year:")
    monitor01.write(tostring(math.floor(year)))
    monitor01.write(" Day:")
    monitor01.write(tostring(dayfinal))
    sleep(1)
end