ISO 8601 is proprietary and people can’t even read it without each paying a $170 access fee. Instead, prefer IETF RFC 3339 (mentioned in your link) which is a m

ISO 8601 is proprietary and people can’t even read it without each paying a $170 access fee. Instead, prefer IETF RFC 3339 (mentioned in your link) which is a more practical open standard.