local function get_time()
    local now = os.date("*t")
    local time = now.hour * 3600 + now.min * 60 + now.sec
    return time / (24 * 3600)
end

minetest.register_on_joinplayer(function(_)
    minetest.chat_send_all(get_time())
    minetest.set_timeofday(get_time())
end)