week numbers: clarify convention and label
Evolution has a valuable calendar option "show week numbers".
However, it's not clear which algorithm is used.
OWA has three options: Start the first week of the year on the
- First day of the year
- First four-day week of the year (ISO 8601), see https://en.wikipedia.org/wiki/ISO_week_date
- First full week of the year
Which one is implemented in Evolution?
Thanks!