ISO website is responding now, though slowly.
The best documentation I've found on month-in-year is
http://www.exslt.org/date/functions/month-in-year/index.html
... which doesn't explicitly answer the question of whether the number is
0-based or 1-based. They cite sample implementations in several languages,
and you could try reverse-engineering those...
But they seem to have been very careful to leave this unspecified. Time to
contact the EXSLT team and ask whether this was deliberate?
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Joe Kesselman / IBM Research
