I was wrong in my previous comment. UTC is in Amsterdam +2 hours because of daylight saving time.
I solved my problem by changing the settings of the Outlook synchonisation plugin (CalDav Synchronizer). I had to synchronize events with UTC time instead of Outlook Appointment timezone. Then the 1 hour shifted time differences between Owncloud and Ubuntu phone calendar appointments were gone.
I was wrong in my previous comment. UTC is in Amsterdam +2 hours because of daylight saving time.
I solved my problem by changing the settings of the Outlook synchonisation plugin (CalDav Synchronizer). I had to synchronize events with UTC time instead of Outlook Appointment timezone. Then the 1 hour shifted time differences between Owncloud and Ubuntu phone calendar appointments were gone.