Hi,
Not sure why you don't want to use library modules. I do, so I am not an expert on POSIX native functions or their Perl implementation. But I do see in the doc for POSIX::strftime:
... the results of some of the conversion specifiers are non-portable. For example, the specifiers aAbBcpZ change according to the locale settings of the user, and both how to set locales (the locale names) and what output to expect are non-standard.
Easy with DateTime (and you don't need to muck around with changing the system locale):
$ perl -MDateTime -E 'say DateTime->from_epoch(epoch => time + $_ * 86
+400, locale => "fr")->day_name for (0..6)'
jeudi
vendredi
samedi
dimanche
lundi
mardi
mercredi
Hope this helps!
The way forward always starts with a minimal test.
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