I don't know, Locale is not a very useful class.
You might want to have a look at ZTimestampFormat, part of
https://github.com/svenvc/ztimestamp(ZTimestampFormat fromString: 'SATURDAY, FEBRUARY 03 2001 (16:05:06)')
french;
format: DateAndTime now.
"'MECREDI, DÉCEMBRE 18 2019 (07:44:07)'"
(ZTimestampFormat fromString: 'SATURDAY, FEBRUARY 03 2001 (16:05:06)')
german;
format: DateAndTime now.
"'MITTWOCH, DEZEMBER 18 2019 (07:44:28)'"
The first argument is an example, based on a reference date. There is lot of documentation.
> On 18 Dec 2019, at 02:55, Esteban Maringolo <
[hidden email]> wrote:
>
> What is the "official way" (if any) to localize the printing of Date
> Month and Day names?
>
> I saw there is a Locale class, but neither the primLongDateFormat and
> primShortDateFormat have any senders, so if they're used, it's not
> through message sends.
>
> Regards!
>
> Esteban A. Maringolo
>