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DATETIME  November 2015

DATETIME November 2015

Subject:

Re: 1/27 conference call notes: an instant can't be on 3 different days

From:

"Edward C. Zimmermann" <[log in to unmask]>

Reply-To:

Discussion of the Developing Date/Time Standards <[log in to unmask]>

Date:

Tue, 24 Nov 2015 20:39:43 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (78 lines)

On Tue, 24 Nov 2015 13:56:03 -0500, Denenberg, Ray wrote
> > From  [UTF-8?]SaaÅ¡ha Metsärantala
> 
> > date -d '2015-11-22T23:00:00-12:00' +%s
> 
> >
> 
> > date -d '2015-11-23T12:00:00+01:00' +%s
> 
> >
> 
> > date -d '2015-11-24T01:00:00+14:00' +%s
> 
> But UTC-12 is the same zone as UTC+12, isn't it.  So the above three 
would be:


The clock time is the same but the day is different.

Right now it is:

07:30 AM Wednesday, 25. November 2015 (GMT+12)

07:30 AM Tuesday, 24. November 2015 (GMT-12)

Baker Island and the Marshall Islands are right now on two different days 
(Weds and Tues)!

> 
> 2015-11-23T12:00:00+01:00
> 
> 2015-11-22T23:00:00+12:00
> 
> 2015-11-24T01:00:00+14:00
> 
> And +12 is between +1 and +14, meaning that it will be the same day as 
either the first or third.
> 
> > > '1-1-1980/12-31-1980'
> 
> >
> 
> > > ..... is as close as you will get with the edtf spec: the interval 
beginning
> 
> > some time during 1-1-1980 and ending some time during 12/31/1980.
> 
> > Likewise
> 
> >
> 
> > 1980-01-01T00:00:00Z/1980-12-31T24:00:00Z
> 
> >
> 
> > would be the duration between (1) some instant during the first second 
of
> 
> > the year 1980 and (2) the very last instant of that year. In other 
words, it
> 
> > would be between 31622399 and 31622400 seconds long, depending om
> 
> > "when" (during that second) within 1980-01-01T00:00:00 the measure was
> 
> > made. There were no leap seconds that year.
> 
> EDTF does not profile time within an interval, only dates.  So my point 
was that using the EDTF spec, that's the closest you'll get, but you can go 
outside EDTF and 8601 allows time within an interval.
> 
> --Ray


--

Edward C. Zimmermann, NONMONOTONIC LAB

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