In MGA5 KDE and previous, I could right-click the clock, choose to adjust digital clock settings, and the dialog for date format included a little spanner button where the date and time formats were explained by mouse-over help, could be adjusted to how I wanted this information displayed. This configuration is also available in systemsettings under the locale module.
With a recent installation of MGA6D1, the KDE Desktop appears to be called Plasma, there is no spanner button in the clock settings, only three static choices for date format, and no such multi-tabbed locale module in systemsettings5.
As far as I understand this, it isn't a welcome loss of function!
working fine on latest plasma.