> Uwe Brauer wrote/hat geschrieben on/am 06.09.2020 17:49:
> I have to correct myself.

> My original note was that

> (setq calendar-day-name-array ["Sonntag" "Montag" "Dienstag" "Mittwoch"
>                    "Donnerstag" "Freitag" "Samstag"]
>       calendar-month-name-array ["Januar" "Februar" "Maerz" "April"
> "Mai" "Juni" "Juli" "August" "September" "Oktober" "November" "Dezember"])

> in .emacs would have an effect on date stamps.

> I found that this is not true. It seems to affect Org Agenda, e.g.

> Week-agenda (W37):
> Montag      7 September 2020 W37
> Dienstag    8 September 2020
> Mittwoch    9 September 2020

> The names of the weekdays in date stamps seem to be unaffected by setq
> calendar-day-name-array. 

This is what I expected!

> So I don't know, why they are in German at my
> computer.

It is done by this setting 

  (set-language-environment "German")
  (set-locale-environment "de_DE.UTF-8")

I did not realized that this  local environment was not properly
installed in my Ubuntu system. Now everything works as expected.