Sync eGroupware with Apple Calendar
Accounts, then click on the plus sign to add a new account and choose
Other CalDAV Account.
Account Type ->
Manual and enter your D-PHYS username and password. For the
Server address use https://groupware.phys.ethz.ch.
Delegation you can toggle the view of other D-Phys calenders for which you have access rights. Alternatively you may add them as separate accounts by providing the full path as
Server address https://groupware.phys.ethz.ch/egroupware/groupdav.php/principals/users/D-PHYS-USERNAME.