potatochronometer

local clock = peripheral.find("manipulator", function(_, o) return o.hasModule "minecraft:clock" end)

local run = true
while run do
    term.clear()
    term.setCursorPos(1, 1)
    local ms = os.epoch "utc" % 1000
    local gametime = os.time()
    local integer = math.floor(gametime)
    local fractional = gametime - integer
    local gametimestring = ("%02d:%02d"):format(integer, math.floor(fractional * 60))
    local out = {
        {"UTC", (os.date "!%H:%M:%S.%%03d %d/%m/%Y"):format(ms)},
        {"Server time", (os.date "%H:%M:%S.%%03d %d/%m/%Y"):format(ms)},
        {"World time", ("%s on %d"):format(gametimestring, os.day())}
    }
    if clock then
        table.insert(out, {"Celestial angle", ("%f degrees"):format(clock.getCelestialAngle())})
        table.insert(out, {"Moon phase", tostring(clock.getMoonPhase())})
        table.insert(out, {"World time (ticks)", tostring(clock.getTime())})
    end
    textutils.tabulate(unpack(out))
    print "Press ; to exit"
    local timer = os.startTimer(0.05)
    while run do
        local ev, param = os.pullEvent()
        if ev == "timer" and timer == param then
            break
        elseif ev == "char" and param == ";" then
            run = false
        end
    end
end