Re:RFC 3339 vs. ISO 8601
by zarzavat on Sunday September 07, 2025 @08:13AM
(#45157497)
Agreed, offsets are an anti-pattern. Any time you have a nonzero offset you almost certainly want either a tz name (e.g. Europe/Paris), a local datetime, an instant, or a formatted string.
[ Parent
| on HN ]
Re:RFC 3339 vs. ISO 8601
by burntsushi on Sunday September 07, 2025 @09:10AM
(#45157879)
> Datetime + tz name: a point in time and space that is responsive to time zone changes
No. It isn't a point in time, because time zone transition rules can and do change. You need an offset as well. Then you can choose which thing you want to prioritize[1] when converting it to an instant in time.
This is what RFC 9557 is for.
[1]: https://docs.rs/jiff/latest/jiff/tz/enum.OffsetConflict.html