HI,

It’s correct that my format string use %a and %b, but the does NOT that yield the locale-specific names, but English names

This is the locale setting on my iMAC 24”, it’s in Danish, but I guess that it’s can be understood

 <applewebdata://2ACAC91B-EE56-40B4-B745-185FB60D5750>
Niels Søndergaard
Mariehøj 236, 2990 Nivå
 <tel:+45 4052 2789>+45 4052 2789niels@algon.dk <mailto:niels@algon.dk>
Ultra posse nemo obligatur.

> Den 22. okt. 2021 kl. 08.34 skrev Eli Zaretskii <eliz@gnu.org>:
> 
>> From: Niels Søndergaard <nisoni@algon.dk>
>> Date: Fri, 22 Oct 2021 03:37:18 +0200
>> Cc: Niels Søndergaard <nisoni@algon.dk>,
>> 51321@debbugs.gnu.org
>> 
>> %c gives: 
>> Which is not the locale's date and time format
> 
> And if you use %b and %a, does that yield the locale-specific names?
> 
> And what are your locale settings outside Emacs?