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----- From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of cf-metadata-requ...@cgd.ucar.edu Sent: Wednesday, September 14, 2016 10:02 PM To: cf-metadata@cgd.ucar.edu Subject: CF-metadata Digest, Vol 161, Issue 3 Send CF-metadata mailing list submissions to cf-metadata@cgd.ucar.edu To subscribe or unsubscribe via the World Wide Web, visit http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata or, via email, send a message with subject or body 'help' to cf-metadata-requ...@cgd.ucar.edu You can reach the person managing the list at cf-metadata-ow...@cgd.ucar.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of CF-metadata digest..." 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.bar...@noaa.gov> To: "cf-metadata@cgd.ucar.edu" <cf-metadata@cgd.ucar.edu> Subject: [CF-metadata] nitpick in time axes example Message-ID: <CALGmxE+S80kd1CnD-55btZZhz=vko-bbbps-bv2w2a-bu0w...@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 -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.cgd.ucar.edu/pipermail/cf-metadata/attachments/20160914/614bb5f3/attachment-0001.html> ------------------------------ Message: 2 Date: Wed, 14 Sep 2016 17:01:34 -0400 From: Jim Biard <jbi...@cicsnc.org> To: cf-metadata@cgd.ucar.edu Subject: Re: [CF-metadata] nitpick in time axes example Message-ID: <88f473d3-243e-0219-cfa8-ac975f510...@cicsnc.org> Content-Type: text/plain; charset="utf-8"; Format="flowed" 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 > 7600 Sand Point Way NE (206) 526-6329 fax > Seattle, WA 98115 (206) 526-6317 main reception > > chris.bar...@noaa.gov <mailto:chris.bar...@noaa.gov> > > > _______________________________________________ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata -- CICS-NC <http://www.cicsnc.org/> Visit us on Facebook <http://www.facebook.com/cicsnc> *Jim Biard* *Research Scholar* Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/> North Carolina State University <http://ncsu.edu/> NOAA National Centers for Environmental Information <http://ncdc.noaa.gov/> /formerly NOAA?s National Climatic Data Center/ 151 Patton Ave, Asheville, NC 28801 e: jbi...@cicsnc.org <mailto:jbi...@cicsnc.org> o: +1 828 271 4900 /Connect with us on Facebook for climate <https://www.facebook.com/NOAANCEIclimate> and ocean and geophysics <https://www.facebook.com/NOAANCEIoceangeo> information, and follow us on Twitter at @NOAANCEIclimate <https://twitter.com/NOAANCEIclimate> and @NOAANCEIocngeo <https://twitter.com/NOAANCEIocngeo>. / -------------- next part -------------- An HTML attachment was scrubbed... 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