For some appointements I get reminded an hour off. My guess is that those are recurring events that have been created in a different daylight saving time and they cross the daylight saving date. The events are shown with their correct time in Kontact(Korganizer). Operating System: openSUSE Leap 15.3 KDE Plasma Version: 5.26.4 KDE Frameworks Version: 5.101.0 Qt Version: 5.15.7 rpm -qa | grep korganizer- korganizer-22.12.0-lp153.210.1.x86_64 korganizer --version korganizer 5.22.0 (22.12.0)