On Fri, Sep 02, 2022 at 09:33:40PM +0800, Ihor Radchenko wrote:
> Uwe Brauer <oub@mat.ucm.es> writes:
> 
> > I see, the question simply is this:
> >
> > How can I achieve that org-time-stamp inserts the date *without* the day
> > name?!
> 
> This cannot currently be customized. However, you can change
> org-time-stamp-formats constant. Removing the %a should be safe.

FWIW, I have this in an (eval-after-load 'org ...)

  (setq org-time-stamp-formats
     '("<%Y-%m-%d>" ."<%Y-%m-%d %H:%M>"))

since years (> 5) and haven't observed any side effects. But then
I don't meet every nook and cranny of org (I bow in awe to those
who meet half of them :-)

Cheers
-- 
t