This is the part that isn’t even technically hard per se. It’s just hard because there’s literally no way to know what the computer should do because there’s no

This is the part that isn’t even technically hard per se. It’s just hard because there’s literally no way to know what the computer should do because there’s no way to know what a human would even expect. In many cases reasonable assumptions can be made, e.g. a calendar event for two people in different time zones to meet on a video call almost certainly needs to be scheduled for a proper time (or likely UTC, which is close enough since if you can ignore leap seconds). Although even then I wonder what the two attendees would expect if, between the scheduling of the event and the event itself, both of their local time zones changed their DST rules such that their UTC offset changed by +1 hours. If only one time zone changed its UTC offset we might assume that the previously agreed upon UTC time would hold, but it’s hard to say what the humans would expect if both of their time zones shifted the same way.