[CF-metadata] nitpick in time axes example

From: Jim Biard <jbiard>
Date: Wed, 14 Sep 2016 17:01:34 -0400

Chris,

CF has consistently maintained adherence to the UDUNITS definition for
the reference time string, and that is different from ISO. (See CF
Section 4.4
<http://cfconventions.org/cf-conventions/v1.6.0/cf-conventions.html#time-coordinate>)
As stated at the top of the section, Z is not used in the case of UTC
and there is a space before any time zone offset. Example 4.4 is written
that way specifically to make it clear that single-digit numbers are legal.

Grace and peace,

Jim


On 9/14/16 3:34 PM, Chris Barker wrote:
> I see in teh doc:
>
> Example 4.4. Time axis
> double time(time) ;
> time:long_name = "time" ;
> time:units = "days since 1990-1-1 0:0:0" ;
> IIUC, ISO 8601 requires two digits for the time pieces [1], so that
> should be:
>
> "days since 1990-1-1 00:00:00"
>
> The parser I use isn't picky about this, but maybe some are?
>
> BTW, as it's an example, we should probably throw a time offset on
> there, too:
>
> "days since 1990-1-1 00:00:00Z"
>
> or
>
> "days since 1990-1-1 00:00:00+00:00"
>
> [1] at least according to wikipedia:
> https://en.wikipedia.org/wiki/ISO_8601#Times
>
>
> -Chris
>
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R (206) 526-6959 voice
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>
> Chris.Barker at noaa.gov <mailto:Chris.Barker at noaa.gov>
>
>
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Received on Wed Sep 14 2016 - 15:01:34 BST