European week numbers to iOS calendar?
I use Week Calendar by UtiliTap instead of the built-in calendar - it's not a free app but it's not expensive and works really well.
Starting with iOS 8, there's now a built-in way to show week numbers in the calendar. Go to Settings -> Mail, Contacts, Calendars and scroll down to the Calendars section. Enable Week Numbers and they show up nicely in the built-in calendar app.
