RFC 3339 vs ISO 8601
last updated: Oct 20, 2023
https://ijmacd.github.io/rfc3339-iso8601/
Lovely illustration of what times, datetimes, and dates are valid by each spec.
I still say ISO 8601 when I mean "standard date format" but I probably should switch to saying RFC 3339 - it has a smaller set of valid times. Maybe I should even learn a name for one of the times that's in the intersection of the two types?