- ISO 8601 is paywalled
- RFC allows a space instead of a T (e.g. 2020-12-09 16:09:…) which is nicer to read.
2 points
The amount of things allowed by ISO 8601 is even more than what’s allowed by RFC 3339, if you take the time to look at https://ijmacd.github.io/rfc3339-iso8601/