SWI-Prolog -- set

Documentation
- Reference manual
  - Built-in Predicates
    - Localization (locale) support
- Packages

Availability:built-in

set_locale(+Locale)

Set the default locale for the current thread, as well as the locale for the standard streams (user_input, user_output, user_error, current_output and current_input. This locale is used for new streams, unless overruled using the locale(Locale) option of open/4 or set_stream/2.