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ISO 8601 is not related to Unicode (ISO/IEC 10646), but if you do care about Unicode you may notice that Unicode CLDR actually supports the preferred first day of the week as a part of locale identifiers [1] (e.g. en-US-u-fw-mon will make the first day of the week Monday, as opposed to the default Sunday for USA).

[1] https://www.unicode.org/reports/tr35/#UnicodeFirstDayIdentif...

The definition of Monday as the first day of the week is strictly for the sake of week numbering over the course of the year and does not indicate that a calendar which displays weeks starting with Sunday violates the ISO standard.

Yep, making Sunday the zero'th day.

:) Nice try, but I'm afraid none of the data elements related to dates are zero-indexed (ie month 0, week 0, year 0, etc)

https://en.wikipedia.org/wiki/Year_zero

update: technically year 0 in ISO 8601 corresponds to year 1 BC

> :) Nice try, but I'm afraid none of the data elements related to dates are zero-indexed (ie month 0, week 0, year 0, etc)

If you ask POSIX, or any date/time API that slavishly copies POSIX (say, java.util.Date or JavaScript's Date object), January is month 0.

This comment made my day. :-)