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* Linux.

** How see current locale settings?

  $ locale

** How see all available locale?

  $ locale -a

** How set date to ISO format?

Usually this be done trough en_DK locale.

You need setup, for example, LC_TIME=en_DK.utf8 at shell init.

*** Debian.

**** Install all available locale.

  $ sudo apt-get install locales-all

**** Generate locales.

  $ sudo dpkg-reconfigure locales

* FreeBSD.

** How see current locale settings?

  $ locale

** How see all available locale?

  $ locale -a