It's 23:50 on April 9th in CEST right now. If I use the mouse wheel to roll to KST/Seoul, it's 6:50 - but clicking the click still shows the date as April 9th, even though it's already the 10th in Korea. Reproducible: Always
Ah yes, the calendar does not react to the timezone changes. It should.
Git commit 5b76b2385b35baa51d0df43cacc88aa3c8f7813e by Martin Klapetek. Committed on 16/04/2015 at 09:59. Pushed by mklapetek into branch 'Plasma/5.3'. Update the date in the calendar/tooltip when user changes clock timezone REVIEW: 123372 M +1 -1 applets/digital-clock/package/contents/ui/CalendarView.qml M +1 -1 applets/digital-clock/package/contents/ui/DigitalClock.qml M +10 -2 applets/digital-clock/package/contents/ui/main.qml http://commits.kde.org/plasma-workspace/5b76b2385b35baa51d0df43cacc88aa3c8f7813e