Chris,
That's a completely valid suggestion. We have to consider implications
for backwards compatibility. Among other things, UDUNITS would need to
change their convention, since CF follows UDUNITS in this matter, as
with all other units. There's nothing that says we can't make changes. I
was explaining the "is" as opposed to the "could be" with time units.
Grace and peace,
Jim
On 9/15/16 7:26 AM, Little, Chris wrote:
> Jim and Chris B,
>
> I would like to weigh in here, please?
>
> Adhering to UDUnits has merits, but once one adopts ISO8601-like notations, as there is no way of specifying otherwise, people assume it *is* ISO8601 and therefore a string without a time zone marker indicates local time (whatever that is - Solar? Mean Solar? Sidereal? National legal?)
>
> There is work just starting in the OGC/ISO pipeline on how to indicate a non-Gregorian calendar using ISO8601 like notation, for the WKT communities.
>
> Personally, I would advocate ISO8601 strict adherence, as most of the recommended best practices and profiles, such as RFC3339, are generally strict subsets of ISO 8601.
>
> Chris
>
>
> -----Original Message-----
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> Sent: Wednesday, September 14, 2016 10:02 PM
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> Today's Topics:
>
> 1. nitpick in time axes example (Chris Barker)
> 2. Re: nitpick in time axes example (Jim Biard)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 14 Sep 2016 12:34:11 -0700
> From: Chris Barker <chris.barker at noaa.gov>
> To: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> Subject: [CF-metadata] nitpick in time axes example
> Message-ID:
> <CALGmxE+S80kd1CnD-55btZZhz=Vko-bbbpS-Bv2w2a-bu0wuvw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 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
>
>
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