This module of the KDE System Settings allows you to select customization options that depend on the region of the world that you happen to live in.
In most cases, you can simply select the region, and all options will be set in an appropriate manner.
On the bottom of this module you can see examples how the settings look like and which measurement units are used. In addition to numbers, you can see how currency values, dates, and times in long and short format are displayed. When you change any of the settings, the preview shows the effects of the changes before you apply them.
The Region drop down box contains the list of available countries and will initially show your currently selected country. If the selection shows “Default” then you have not set a country and are defaulting to the Country set by the system, which will also be shown.
In case you need different individual settings enable Detailed Settings and select the country format for Numbers, Time, Currency, Measurement Units or Collation and Sorting rules from the drop down boxes.