Re-export time's well_known formats.

[sedrik]

Would it make sense to re-export the well_known formats from time?

https://docs.rs/time/0.3.9/time/format_description/well_known/index.html

That way formatting a OffsetDateTime could be .format(&Rfc3339) instead of having to spell it out all together.

[abonander]

I'd rather not. The only reason the types from time are reexported in the first place is give them predictable paths for the macros since crates can be renamed.