I think what dom0 means is a situation like the following. Say you want to schedule, on a calendar, an event that happens daily at 2PM in your local timezone, s

I think what dom0 means is a situation like the following. Say you want to schedule, on a calendar, an event that happens daily at 2PM in your local timezone, say America/New_York. If you record that even as happening at 2200 UTC each day, when DST rolls around, it'll shift to 1PM or 3PM in the local timezone. This is not what the user wants. Here, despite storing everything in UTC and attempting to apply DST as late as possible as if it were a "display issue" — normally the right thing — here results in the wrong outcome.