actually its easier because you just apply the UTC offset, and that is assuming its a cold call. If your setting up a call via email or chat or something like that you just say what time do you want to talk tomorrow. I work from UTC 13:00-21:00, and I see that you work UTC 07:00-15:00. How about we have our call at UTC 14:00?

doing this type of international communication gets simpler because now you dont need to convert into a local reference on both sides. Since you both work in UTC you have a standard reference and all the conversion is unnecessary.

“i will call you tomorrow” already does not define a time period. And nothing is stopping Noon from being a local time, its just that your noon in Hawaii would be UTC -10. So saying I will call you tomorrow afternoon still means I am calling in the later half of the day even in global UTC. You are just defining it with a local reference.

Currently if I want to call someone in Japan, or Australia I already cant say I will call you tomorrow afternoon, because its already tomorrow when I get up.

The only reason why you need to do math is because you’re not used to it. Once you’re used to it you can just apply your local offset if you absolutely need to but otherwise you would just wake up when it’s time to wake up and your UTC and you’d go to bed when it’s time to go to bed in your UTC.

I keep arguing for this but everybody thinks I’m crazy. They say stupid stuff like but what time would school start kids would be getting up at 8:00 a.m. and it could be the middle of the night.