Talk:ISO 8601

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Wikipedia dates[edit]

Some people have proposed using ISO 8601 for Wikipedia dates. For more of this discussion, see Wikipedia talk:Manual of Style (dates and numbers).

It appears that it's rapidly becoming a de facto standard (if not yet de jure) at least for dates in Wikipedia citations.


The Long Now foundation suggests that years should be written with five digits (ie 02003 for the year 2003) in order to avoid the Year 10,000 problem.

This is pointless: all it does is push the problem forward a few years to 100,000, and situation already exists for dates in the past (-10,000 and earlier.) May as well accept that the year number can have a varying number of digits -( 18:57 22 Jun 2003 (UTC)

Without seeing that I assumed they were serious! Brianjd

Time Intervals[edit]

I have a problem with the interpretation of <start>/<end> intervals. There is an example in the text that "2007-11-13/15" could be expanded to "2007-11-13T00:00/15T24:00". Well, that is logically wrong. I don't know where the error lies, in this wiki article or the iso-8601 standard itself (i couldn't get a copy). "2014-03-14/2014-03-15" surely means 24 hours like "2014-03-14T10/12" covers only two hours instead of the suggested three. This is how dates are handle in praxis (eg see ical), the same logic must be applied to all elements. It doesn't mean from .. including to, rather include from .. exclude from.

2007-11-13/15 can be read as "any time on 2007 November 13 to any time on 2007 November 15", ie including at least part of the first and last days. So the duration could be anything from just over 1 to just under 3 days. As the article says, if a more precise time is required, it could be 2007-11-13T00:00/15T24:00, but it could also be 2007-11-13T23:59/15T00:00 (just over one day).
Similarly 2014-03-14T10/12 could be anything between about 1 hour (10:59/12:00) and 3 hours (10:00/12:59).
You appear to be assuming that the time of day denoted by each of 2007-11-13 and /15 has to be the same (nominally the start of day) - it does not. If you want a specific time within the day you need to specify it.
That being said, the article does need rewording, because 2007-11-13/15 is not the same as 2007-11-13T00:00/15T24:00. Mitch Ames (talk) 03:52, 15 March 2014 (UTC)
I've updated the article accordingly. Mitch Ames (talk) 04:03, 15 March 2014 (UTC)

Unix ddate[edit]

Suggest covering the Unix ddate command. ;-) (talk) — Preceding undated comment added 09:13, 14 May 2014 (UTC)