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[3.13] gh-154460: Do not use wcsftime() on OpenBSD (GH-154461) #154476

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Merged
serhiy-storchaka merged 1 commit into from
Jul 22, 2026
+9 −0
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[3.13] gh-154460: Do not use wcsftime() on OpenBSD (GH-154461) #154476

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-07-22-13-00-00.gh-issue-154460.wCsFtM.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix :func:`time.strftime` and :meth:`datetime.datetime.strftime` returning a
wrong ISO 8601 week number (``%V``) on OpenBSD.
7 changes: 7 additions & 0 deletions Modules/timemodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -767,6 +767,13 @@ Other codes may be available on your platform. See documentation for\n\
the C library strftime function.\n"

#ifdef HAVE_STRFTIME
// gh-154460: OpenBSD's wcsftime() computes %V incorrectly: it returns 53
// whenever the ISO 8601 week belongs to a different year than tm_year.
// strftime() is not affected.
#ifdef __OpenBSD__
# undef HAVE_WCSFTIME
#endif

#ifdef HAVE_WCSFTIME
#define time_char wchar_t
#define format_time wcsftime
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