Yeah, it seems like there's no general solution to this. If I put in '10AM in Chile' for grabbing coffee with a friend, I probably want it to stay in wall time

Yeah, it seems like there's no general solution to this. If I put in '10AM in Chile' for grabbing coffee with a friend, I probably want it to stay in wall time no matter what happens to the offset. If I'm making a note of a solar eclipse, I need it to stick with physical time, and if the offset changes the reported time changes. If I'm scheduling a conference call to Australia, then when the offset changes, one of us is going to have to reschedule, and my calendar can't know which. (We might both have to reschedule, if neither of us can move it by a single hour.) It might be able to say "you scheduled this at 10AM, but the DST rules changed, and that physical time is now 11AM wall time, what to do?" My Australian colleague isn't going to get that warning, unless her calendar knows that she's talking to someone in Chile, but as long as one of us knows about the problem, we should be okay. But I'm not sure I trust this to cover all bases.