strftime is implemented in glibc or your standard C library, so I don't think this issue is related specifically to Perl. Perhaps you can use POSIX::strftime for _just_ the numerical/time bits, then feed this into sprintf.

In reply to Re: strftime does not handle Unicode characters in format argument properly (at least, not consistently) by perlfan
in thread strftime does not handle Unicode characters in format argument properly (at least, not consistently) by Bruder Savigny

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