ISO 8601
ISO 8601
ISO 8601
Disregard ISO8601. Acquire RFC3339. You can leave off the T if you want to, or replace Z with +00:00
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with ISO 8601:
Sure, how about 2018-W06-1? Or 2018-036?
ISO 8601 contains way too many obscure formats. RFC 3339 is pretty much a subset and defines only sensible ones. It also allows 2018-02-05 08:02:43-00:00 (no T and explicitly specifying no timezone)
Acquiring the document (legally) to ensure compliance for ISO 8601 is relatively expensive for a single person (~$200 USD), while RFC 3339 is accessible for free.