LISTSERV mailing list manager LISTSERV 16.0

Help for DATETIME Archives


DATETIME Archives

DATETIME Archives


DATETIME@C4VLPLISTSERV01.LOC.GOV


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Monospaced Font

LISTSERV Archives

LISTSERV Archives

DATETIME Home

DATETIME Home

DATETIME  July 2011

DATETIME July 2011

Subject:

Re: On the usefulness of x

From:

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

Reply-To:

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

Date:

Tue, 5 Jul 2011 09:21:41 +0200

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (70 lines)

On Wed, 29 Jun 2011 18:14:06 +0200, [UTF-8?]SaaÅ¡ha Metsärantala wrote
> Hello!
>
> The x-letter has lead to several misunderstandings. I tentatively suggest
> something.
>
I do not think that 'x' has led to any misunderstandings rather I suspect
that the concept of precision applied to dates continues to meet with
some "misunderstanding".

1x == P10(1n)
1xx == P100(1nn)
1xxx == P1000(1nnn)
where n is any of 0..9 and P10, P100 and P1000 could be read as precision of
10, resp. 100 and 1000.
Examples:
196x matches P10(1962), P10(1968).. in fact any of 1960..1969

While a more general precision qualifier (Pn) might be more generic, in
practice, I do suspect that-- like the year, month, day, hour or minute
precision we have implicitly defined within ISO 8601-- decade (10 years)
and "century" (100 years) are (by far) the most common. Both decade and
century are so deeply embeded in western culture that these "arbitrary"
marks effect events themselves.

While I am on the topic.. Ray has suggested that in intervals the start and
end are of the same precision. I do not agree. The most trivial counter-
example are open intervals but we often have less precise start than end
points. Example: 1763/1776-07-04

Looking at more contemporary events.. When did the movement to topple Hosni
Sayyid Mubarak start? He resigned on 11 Feb 2011 but when did the
demonstartions start? Our measurement precision is not very good. 25 Jan? 17
Jan? 23 Jan (when the Muslim Brotherhood announced their intent to
participae in the 25 Jan demo)? 2 Feb? Or much earlier? In Tunesia we can,
at best, agree on Dec 2010 as the start there... Mohamed Bouazizi setting
himself ablaze on 17 Dec 2010 became a symbol that gave the movement some
media momentum but it was not the start of the escalation.. All we really
have is 14 Jan 2011 as the date when Ben Ali was ousted.. There are loads of
similiar examples.. The Russian Revolution, for example, is a collective
name for a series of "revolutions".. We call them collectively the "1917
Revolution".
Examples where the start is of a higher precision than end, I think, are
also easy to think of... When, for example, did the Soviet Union end? Dec.
1991? 25 Dec. with the resignation of Gorbachev or in early 1992 with the
establishment of the "commonwealth"?

On Fri, 1 Jul 2011 17:50:26 +0200, [UTF-8?]SaaÅ¡ha Metsärantala wrote
> Hello!
>
> > > the "x"-concept [...] in the context of CQL.
> > It doesn't make sense to me.
> I would be pleased to discuss this further within the context of a list
> about CQL or another query related list. Of course, we could extend EDTF

Those in the CQL and other query language communities are invited to join
this discussion. This list has been announced serveral times, for instance,
in various CQL, SRU/W and Z39.50/ISO23950 lists.

> Regards!
>
> [UTF-8?]Saašha,


--

Edward C. Zimmermann, NONMONOTONIC LAB
http://www.nonmonotonic.net
Umsatz-St-ID: DE130492967

Top of Message | Previous Page | Permalink

Advanced Options


Options

Log In

Log In

Get Password

Get Password


Search Archives

Search Archives


Subscribe or Unsubscribe

Subscribe or Unsubscribe


Archives

August 2019
February 2019
December 2018
November 2018
October 2018
January 2018
August 2017
July 2017
June 2017
April 2017
March 2017
February 2017
August 2016
July 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
December 2014
November 2014
March 2014
September 2013
May 2013
February 2013
October 2012
September 2012
August 2012
May 2012
March 2012
December 2011
November 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
February 2010
January 2010
December 2009
November 2009

ATOM RSS1 RSS2



LISTSERV.LOC.GOV

CataList Email List Search Powered by the LISTSERV Email List Manager