Created attachment 118329 [details] screenshot SUMMARY See the screenshot please. Time below the analog clock is 10:42:32pm. Digital clock shows 22:46. Operating System: Arch Linux KDE Plasma Version: 5.15.1 KDE Frameworks Version: 5.55.0 Qt Version: 5.12.1
Created attachment 118330 [details] "Date & Time" showing "Unable to set current time" error Something maybe related: I get an error message after uncheck "Set date and time automatically" and click "Apply" button in "Date & Time" kcm.
Did you by any chance override the digital clock to always show 24-hour time? Right-click on it, click "Configure Digital Clock and see if "use 24-hour clock" is checked. Does it get fixed if you toggle that on and off again?
"Use 24-hour clock" was already checked. Uncheck and check it again does no difference.
(In reply to Patrick Silva from comment #3) > "Use 24-hour clock" was already checked. Well, that's why then. :) You've set the digital clock to always use 24-hour time, overriding the 12-hour time specified in the system locale.