YYYY.MM.DD and 24 hour for sure.

Everyone using UTC? Nah. Creates more problems than it solves (which are already solved, because you can just lookup what time it is elsewhere, and use calendars to automatically convert, etc.).

I for one do not want to do mental gymnastics /calculation just to know what solar time it is somewhere else. And if you just look up what solar time it is somewhere, we’ve already arrived back at what we’re already doing.

Much easier just looking up what time (solar) time it is in a timezone. No need to re-learn what time means when you arrive somewhere on holiday, no need for movies to spell out exactly where they are in the world whenever they speak about time just so you know what it means. (Seriously, imagine how dumb it would be watching international films and they say: “meet you at 14 o’clock”, and you have no idea what solar time that is, unless they literally tell you their timezone.)

Further, a lot more business than currently would have to start splitting their days not at 00:00 (I’m aware places like nightclubs do this already).

Getting rid of timezones makes no sense, and I do not understand why people on the internet keep suggesting it like it’s a good idea.