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On 2020-08-20 19:54:16 +0200 (+0200), Pierre Riteau wrote:
[...]
> Unless I am mistaken, a schedule based on the Nth day of month is not
> fixed to even or odd weeks.
> For example, in June the first and third Monday were in weeks 23 and
> 25 (odd), but since July they take place in even weeks.
[...]

Correct, this is documented in the README.rst for the yaml2ical
library, which irc-meetings uses to render this metadata into
scheduling:

https://opendev.org/opendev/yaml2ical#user-content-frequencies

"biweekly-odd Occurs on odd weeks (ISOweek % 2 == 1)"

"Odd/Even and week numbers are based on the ISO week number. ISO
weeks can be checked with %V in GNU date(1)"

I think some people have assumed it's even/odd week numbers in a
month rather than even/odd week numbers counting from the epoch.
Technically we have frequencies like "first-tuesday" and
"third-tuesday" to address specific week numbers in a month rather
than truly alternating weeks.
-- 
Jeremy Stanley
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