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On Thu, 18 Aug 2011 16:15:27 +0200, [UTF-8?]SaaÅ¡ha Metsärantala wrote > Hello! > > > The date 2012-02-30 using the (very short lived) Swedish calendar is still a valid date > Well, 1712-02-30 is "valid" in this calendar, but not in the (gregorian) > astronomical one and thus nothing for today's EDTF without conversion. There are a very large number of calendars. Some like the Swedish are no longer in use but others like the Hebrew/Jewish are still actively being used and developed. Dates from one to the other must be converted. Sometimes its easy.. and sometimes its quite difficult or possible only with lower precision. > AFAIK, no plans were ever made at all to consider 2012-02-30 as a valid > date within the Swedish calendar. Have you some references about the > "2012-02-30" issue? Do not confuse a calendar with its common use. The Swedish calendar became "obsolete" in 1711 when Sweden decided to return to a Julian based calendar starting in 1712. A day was added to the leap year allowing for a 30 Feb 1712. While the calendar used was more or less Julian based it did have a number of "Swedish tweeks". After 40 years of evolutionary tweeking (a tradition of self-declared "Revolutions in little steps")of the Julan calendar Sweden adopted yet another calendar: the Gregorian (well not really.. more a Swedish variant but..). [as a side note on use: its quite common for computer programs to internally use a Julian calendar to store dates given the simplicity of arithmetic over the International (Gregorian).] The whole point is.. These are all unique calendars and not the same as the International calendar currently in use.. > > Anyway, maybe we could just keep a record of this issue and move this > discussion to the next phase. > > Regards! > > [UTF-8?]SaaÅ¡ha, -- Edward C. Zimmermann, NONMONOTONIC LAB http://www.nonmonotonic.net Umsatz-St-ID: DE130492967