[masklinn]

If you’re actually working with dates (e.g. calendaring), storing dates as UTC is a potentially critical loss of information.

Basically, UTC is mostly fine for recording past events (e.g. event logs though even then pre-1970 events can be problematic), but for any future event it’s very risky, because time zones « move around » sometimes with very little heads up (down to weeks if not days for DST) but a user working in a specific time one expects their stuff to be fixed in their time zones’ frame of reference.

But of course this indices the problem of ambiguity around DST switch & other backwards TZ movements.