[elgaard]

Yes, timezones do not at all work with reservations for physical objects.

I work on a registration and reservation system for rowing boats in my rowing club https://github.com/dsroklub/roprotokol

The only time that matters is whatever the clock in the clubhouse shows (Danish time) If you sign out a boat from the UK (or more realistically from a laptop that thinks it is in the UK) at 14:00 it is still 14:00 Danish time. This is surprisingly difficult to achieve with JS Date object, browsers and popular JS components.

So the Temporal Plain time looks promising.

And especially the explicit timezones. Because even without timezone you need to handle DST. For example my system needs to know that if you start a 3 hour trip at midnight a certain day in the spring, you are expected back at 04:00.

I just hope that browsers and components will support is properly.