Notes from ODF TC meeting 4 October 2021

Patrick2: agenda - by consent

Patrick2: change minutes to reflect correct date in email

Patrick2: Alfred has joined - updated attendance

Patrick2: minutes approved with the correction of the date of the meeting in the subject line

Patrick2: Francis - current ISO standard is now two parts - part 2 is already in the bibliography of ODF - new edition makes no reference to proleptic calendars

Patrick2: before 1582-10-15 - agreement of the parties

Patrick2: gregorian: Gregorian calendar for dates commencing 1582-10-15 as specified in [ISO8601].

Patrick2: could specify proleptic gregorian calendar - but we have said something before about them

Patrick2: Perhaps a note on proleptic Gregorian calendars

Patrick2: no longer specifies what that is, if implementer needs a mechanism - then the entry in the bibliography points to ways to do it.

Patrick2: Andreas - need something about previous states

Patrick2: Andreas - there are other calendars before 1582 -

Patrick2: Need to say something but the question is what to say =

Patrick2: Francis = may need to reference the earlier text specifically

Patrick2: Andreas: part 4 - 7.4 Year 1583

Patrick2: Francis would need to remove proleptic - not in current iso standard

Patrick2: 19.341 number:calendar gregorian - defined in part 4 7.4

Patrick2: Last sentence of part 4, 7.4 - However, years that are divisible by 100 shall also be divisible by 400 to be a leap year; otherwise, they are common (non-leap) years.

Patrick2: Years that are divisible by 100 shall also be divisible by 400 to be a leap year. (closer?)

Patrick2: need to remove "proleptic"

Alfred Hellstern: Years that are divisible by 100 and also divisible by 400 shall be a leap year.

Alfred Hellstern: Years that are divisible by 100 and not also divisible by 400 shall be common (non-leap) years.

Andreas Guelzow: All years evenly divisible by 4, except years that are divisible by 100 and not also divisible by 400, are leap years.

Regina Henschel: What date has the day before 15. October 1582? Is it 14. Oct or 4. Oct.?

Patrick2: Regina - need to say something about it being the 14th of October.

Patrick2: Regina - LO gives the 4th of Oct - switching calendars based on location

Patrick2: Andreas - part 4 says 1583 because it was Gregorian forward

Patrick2: part 3 should reference part 4 for the Gregorian calendar , part 4 may need some word smithing, and part 4 - the normative reference need updating to current, now says 8601:2004

Patrick2: remove references to proleptic in part 4

Patrick2: Andreas - can remove references to ISO in 7.4 Year 1543 - add explanation of proleptic behind its first usage

Patrick2: Andreas: These calculations use the proleptic Gregorian calendar (continuing the years backwards as if the calendar existed in those years).

Patrick2: bad edit on my part

Regina Henschel: Evaluators claiming to implement Year 1583 can correctly calculate dates correctly starting from the January 1 of the (ISO) year 1583. This means that the evaluator correctly determines that 1900 was not a leap year, and can handle year values for dates back to at least 1583. These calculations use the ISO (Gregorian) calendar, that is, the calculations use the usual rules for the ISO (Gregorian) calendar, regardless of locale.

Regina Henschel: This calendar began official use in some locales in 1582, but other locales used other calendars (such as the Julian calendar) and switched to the Gregorian calendar at different times in history, if they switched at all. Evaluators may choose to support years even earlier than this; such evaluators should use a proleptic Gregorian system (continuing the years backwards as if the calendar existed in those years). Note that not all people used, or currently use, the ISO (Gregorian) calendar.

Patrick2: All years evenly divisible by 4, except years that are divisible by 100 and not also divisible by 400, are leap years.

Patrick2: Replace last sentence in last paragraph with the text from Andreas

Patrick2: Patrick to clean up and post in issue

Patrick2: Regina has tested another application in the issue

Patrick2: Adjourned

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