I have a DateTime property bound to the Text property of a Run element using a StringFormat for ShortDate (StringFormat=d), but it's using en-US culture instead of the system culture (pt-BR). My code looks like this:
<TextBlock>
Next date
<LineBreak />
<Run Text="{Binding Date, StringFormat=d}" FontWeight="Bold" />
</TextBlock>
I used the code from this link to override the culture for all my components.
Thread.CurrentThread.CurrentCulture = new CultureInfo("en-IN");
Thread.CurrentThread.CurrentUICulture = new CultureInfo("en-IN");
FrameworkElement.LanguageProperty.OverrideMetadata(typeof(FrameworkElement), new FrameworkPropertyMetadata(
XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.IetfLanguageTag)));
It does work for some components, but it didn't work for that Date format.