Does seem a surprising omission. I’d expect offset support, and like more recent fancier draft stuff from https://www.ietf.org/archive/id/draft-ietf-sedate-date

Does seem a surprising omission. I’d expect offset support, and like more recent fancier draft stuff from https://www.ietf.org/archive/id/draft-ietf-sedate-datetime-extended-06.html https://www.ietf.org/archive/id/draft-ietf-sedate-datetime-e..., Internet Extended Date/Time Format, where you can specify a named time zone rather than just an offset.