All times are Monaco time (CEST). The countdowns use Monaco time even if your phone is set to another time zone.
To use it offline, open the page once with a connection, then add it to your home screen (Share, then Add to Home Screen on iPhone; the menu, then Install app on Android).
Changes are saved for everyone using the app.
Ticked groups that already have this visit are updated. Other ticked groups get it added.
Tap your name.