I picked UK regional & English UK plus UK Keyboard.
If i check this in Settings in KDE is shows UK.
But it keeps displaying US date format all over in settings page in Dolphin.
You can reset it then reboot it shows correct but after next reboot back to US format.??
Is this a bug or am i missing some other settings i need to change.
I have just re selected UK rebooted and here are the images
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