Zomertijd en wintertijd

Choose ‘Apple / phone’ and confirm the subscription. The calendar then updates by itself.

Choose ‘Google Calendar’ and click ‘Add’. On a phone, subscribe on a computer first; the calendar then shows up in the app too. Google does not refresh subscriptions instantly.

Choose ‘Outlook’ and import the calendar as a subscription. If that does not work, copy the link and choose ‘Add calendar › Subscribe from web’ in Outlook.