The cause was using the wrong character in formatting the year. We now
switch from `Y` to `o` which will work based on the week instead of
date. This is necessary as we provide this year to the week, and
therefore need the year of the week, not day.
Resolves: #11388
Add new action and model.
Also allow to get days of year and month.
Not always a week is helpful, sometimes all days of year or month are
more helpful.