Zitat:

Binding converters never use the CurrentCulture - this is by design, so that their behavior is predictable across all machines and regional settings. However, you can specify the culture a converter should use. There are two ways to do this: 1. Set Binding.ConverterCulture. E.g. <TextBox Text="{Binding Birthday, ConverterCulture=de-DE}"/> 2. Set the xml:lang (or equivalently, Language) property on the target element. E.g. <TextBox xml:lang="de-DE" Text="{Binding Birthday}"/> The converter uses the ConverterCulture if present, and the xml:lang otherwise. The latter property is always defined - it defaults to "en-US". It's an inherited property, so you can set xml:lang="de-DE" on the root element of your markup to get all the converters on the page to use the desired culture.