bpo-34512: Document platform-specific strftime() behavior for non-ASCII format strings (GH-8948)

(cherry picked from commit 1cffd0eed3)

Co-authored-by: Alexey Izbyshev <izbyshev@ispras.ru>
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Miss Islington (bot) 2019-01-12 09:27:30 -08:00 committed by GitHub
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@ -2034,6 +2034,12 @@ calls the platform C library's :func:`strftime` function, and platform
variations are common. To see the full set of format codes supported on your
platform, consult the :manpage:`strftime(3)` documentation.
For the same reason, handling of format strings containing Unicode code points
that can't be represented in the charset of the current locale is also
platform-dependent. On some platforms such code points are preserved intact in
the output, while on others ``strftime`` may raise :exc:`UnicodeError` or return
an empty string instead.
The following is a list of all the format codes that the C standard (1989
version) requires, and these work on all platforms with a standard C
implementation. Note that the 1999 version of the C standard added additional