My solution: 1) open Performance Monitor; 2) kill the process "indicator-datetime-preferences" (if you tried to open the preferences it should be there); 3) click again on "Time & Date Settings ...". I hope this helps.
My solution: datetime- preferences" (if you tried to open the preferences it should be there);
1) open Performance Monitor;
2) kill the process "indicator-
3) click again on "Time & Date Settings ...".
I hope this helps.