Incidentally, this works for someone close to the UTC time (3h off for Moscow) for the reasons you mention. It likely does not generalize at all. They also ha

Incidentally, this works for someone close to the UTC time (3h off for Moscow) for the reasons you mention. It likely does not generalize at all. They also haven't faced an issue where an event is booked by someone else at a DST-affecting time: as that time changes between two days, you now need an extra "if" in your brain (is it DST there? Europe and US are on different cycles there too). I've tried booking all the cross-timezone meetings in UTC, but didn't get far with it: it was more work for everyone compared to somewhat reduced confusion and suddenly overlapping meetings.