Comment by lelandbatey

That is not true. I refer you to a PDF copy of ISO 8601[1] (a 2016 working draft copy, but still representative). Within section "4.3.2 Complete Representations" it reads as follows:

> The character [T] shall be used as time designator to indicate the start of the representation of the time of day component in these expressions. The hyphen [-] and the colon [:] shall be used, in accordance with 4.4.4, as separators within the date and time of day expressions, respectively, when required.

> NOTE By mutual agreement of the partners in information interchange, the character [T] may be omitted in applications where there is no risk of confusing a date and time of day representation with others defined in this International Standard.

They then show examples which clearly show that they mean you can not-include the T, but you CANNOT substitute T for a space.

Unless I am incorrectly reading the document or unaware of a further section indicating the further allowance of substituting a T for a space, you cannot swap T for space according to the standard.

1 - https://www.loc.gov/standards/datetime/iso-tc154-wg5_n0038_i...