At this point I would go so far as to say that the time zone system is an archaic hack. If we want to do things with respect to sunrise and/or sunset we can jus

At this point I would go so far as to say that the time zone system is an archaic hack. If we want to do things with respect to sunrise and/or sunset we can just do that and use UTC for everything else. Note that solar time can be determined with a small algorithm based on latitude and longitude that can fit in small embedded devices. The only remaining question is; what location should be used?