This presents itself as a slam dunk, but it isn't. In short you can do this visually on a computer. I currently have a widget in my calendar dropdown with the

This presents itself as a slam dunk, but it isn't. In short you can do this visually on a computer. I currently have a widget in my calendar dropdown with the timezones of several cities that occasionally need to be tracked for meetings. Each one has a little clock face, that could show day/night times in other cities. Like this: https://cdn2.vectorstock.com/i/1000x1000/16/61/clock-day-and-night-concept-vector-5201661.jpg https://cdn2.vectorstock.com/i/1000x1000/16/61/clock-day-and... I think iOS used to have it as well. Gnome2/Mate had a fantastic day/night view of the Earth in its calendar widget as well. Didn't seem to make it to the new dumbed-down desktops sadly. I've used xplanet for this too. Even in the old days, you should have looked it up before placing an international call. Anyway, you're going to need technology to solve this one way or the other, especially when meeting folks halfway around the world. So everyone using UTC is not an impediment. Just a different way of working, which is the hard part. But not everyone has to change at once. Could be one organization at a time. Not even saying I'd prefer it, but it is reasonable to try.