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And I should have included this recent gem... https://www.theguardian.com/technology/2018/jul/25/big-tech-warns-japan-mill ennium-bug-y2k-emperor-akihito-abdication -----Original Message----- From: Toby Considine [mailto:tobyconsidine@gmail.com] On Behalf Of Toby Considine Sent: Wednesday, August 15, 2018 11:05 AM To: 'Norman Gray' <norman@astro.gla.ac.uk>; 'Peter Flynn' <peter@silmaril.ie> Cc: xml-dev@lists.xml.org Subject: RE: Here's the regex for the xs:dateTime datatype Well noted, Peter & Norman. I was not aware that GMT bumped the day at noon... This does not even touch on the problems of time zones, and that the machine readable registry of time zones and DST rules is a server that as of three years ago was a hobby. I remember because folks were worries about his upcoming retirement... Time Zones are not just the even 24 hours evenly distributed by geography except for slight deformations for political boundaries, but are off by quarter and third of an hour increments in some places. Two countries still arbitrarily announce change to DST a week or so ahead of time each year. This may seem a trivial distinction, but there was a time not so many years ago when the California Power Market neglected to buy power for the 25th hour one Fall.... One can say just use Universal Time, but so long as things are scheduled to support people, and people live in the public time, there will always be a need to communicate unambiguously when is power or water purchased, when do local markets close, when do options in resource markets expire... These issues consumed a third of the time the IETF / OASIS joint work to support smart energy. In the USA, multiple states are considering changing time zones, or doing away with DST. This means crossing an internal border may be a two hour time jump some times of the year... For those interested in time, Europe is seeking comments on rearranging Summer Time: https://ec.europa.eu/eusurvey/runner/2018-summertime-arrangements tc -----Original Message----- From: Norman Gray [mailto:norman@astro.gla.ac.uk] Sent: Tuesday, August 14, 2018 5:21 PM To: Peter Flynn <peter@silmaril.ie> Cc: xml-dev@lists.xml.org Subject: Re: Here's the regex for the xs:dateTime datatype On 14 Aug 2018, at 21:44, Peter Flynn wrote: > On 14/08/18 17:39, Toby Considine wrote: > >> And as we wander down the road toward the one true solution, be sure >> to consider the non-Gregorian issues that can be quite engrossing. > > > Indeed they can. In the CELT project, we have old Irish annals of > varying sorts, using Anno Mundi which sets year zero as 5199BCE. ...and of course Greenwich Mean Time (naval/astronomical, pre-1925), which looks just like everyone else's notion of the calendar, but which has the day number increment at noon. Or the post-1920s Orthodox calendar, which looks like everyone else's calendar but which sneakily throws off the previous message's regexp for leap years by having a different rule from everyone else. (this is fun -- I've got a whole book-ful of these, with conversion algorithms available for the seriously keen). Best wishes, Norman -- Norman Gray : https://nxg.me.uk _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@lists.xml.org subscribe: xml-dev-subscribe@lists.xml.org List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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