If you have an iPhone or iPad and use the calendar there, then you might also want to know how to display the calendar weeks in it. The appropriate setting can be found in the iOS system settings as follows:
Show calendar week - Calendar App iPhone and iPad
1. Open the "Settings" on the iPhone
2. Select the entry "Calendar
3. You now see an option with "calendar weeks" - activate the slider
- Activate iPhone calendar weeks
The calendar app of the iPhone or iPad now displays the calendar weeks as well as the weekdays.