We're using `isoformat` and `fromisoformat` to serialize/deserialize datetimes, [which unfortunately doesn't handle the `Z` formatting for UTC](https://stackoverflow.com/questions/19654578/python-utc-datetime-objects-iso-format-doesnt-include-z-zulu-or-zero-offset). When deserializing datetimes, we would like **both** offsets (e.g. `-05:00`) and `Z` to be supported.
We're using
isoformatandfromisoformatto serialize/deserialize datetimes, which unfortunately doesn't handle theZformatting for UTC.When deserializing datetimes, we would like both offsets (e.g.
-05:00) andZto be supported.