Coordinates model - Working draft.

[Arnold Rots]

And this is precisely the part of ISO 8601 that does not make sense in
astronomy: the exclusive choice between a time zone and UTC. Hence, the
community has accepted a limited version of the ISO 8601 value string which
is required to be associated with a specification of the time coordinate
frame (including a time scale).
See FITS WCS Paper IV.

Cheers,

  - Arnold

On Thu, Jan 10, 2019, 17:11 Graham, Matthew J. <mjg at caltech.edu wrote:

> The ISO 8601 spec is very clear: "The   zone    designator      is
> empty   if      use     is      made    of      local   time    in
> accordance      with    4.2.2.2 through 4.2.2.4,        it      is
> the     UTC     designator      [Z]     if use  is      made    of
> UTC     of      day     in      accordance      with    4.2.4   and     it
>     is      the     difference-component    if      use     is      made
> of      local   time    and     the     difference      from    UTC     in
>     accordance      with 4.2.5.2.” If you don’t use the zone designator as
> in the standard then it’s not ISO 8601.
>
> — Matthew
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