These simple steps show how to add an ownCloud calendar on Mac.
Before you begin
Before you begin please check if your ownCloud is configured properly.
Install OneCalendar
Download OneCalendar from the store and install it on your device.
Select Accounts overview
Select the OneCalendar menu on the top left, and select the option "Accounts".
Select Add account
Click on the "+" sign to add a new account.
Select Account type
Click on the "ownCloud" account type.
Enter credentials
Determine CalDAV URL