You can export appointments in the iCal format. You can e.g. use this format
to exchange appointments with other calendar applications. You can export
individual appointments or all appointments from a calendar.
How to export individual appointments:
Depending on the view, you have the following options:
Click on an appointment in a calendar view. Click the More
actions icon in
the pop-up.
Select an appointment or multiple appointments in the list view. Click the
More actions icon in the tool bar.
Click on Export.
Result: The iCAL file with the appointments exported will be created in the
download folder.
How to export all appointments from a calendar:
Select a personal or public calendar in the folder view.
Click the Actions icon next to the calendar. Click on
Export.
Result: The iCAL file with the appointments exported will be created in the
download folder.