Date support

[icanzilb]

Ideally the encoder/decoder should be able to write/read dates. The question is how to make those human friendly for editing? Obviously a fully-qualified date contains a lot of information which isn't quite "friendly" to edit by hand.

This seems like a good opportunity for adding a date strategy like for JSONEncoder and maybe add some predefined "human friendly" formats.

[DivineDominion]

Would suggest to start with ISO date formatter to at least get dates like 2022-09-07 (not Dates) right.
https://sarunw.com/posts/how-to-parse-iso8601-date-in-swift/

Date and time becomes tricky, though, because ISO timestamps are 🤮

So if users enter 2022-09-07 15:45, the parser should maybe produce a String instead of extracting a Date from 2022-09-07 ignoring the time, because that'd be pretty confusing.

[icanzilb]

Yeah, I have similar feelings about parsing dates ... not to mention that without a timezone a string date means nothing so I'm very cautious just adding this willie-nilly. I'm so burned by parsing dates that I ponder with the idea of just not having this feature at all but I can see how this might be something useful to have ...