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gh-88994: Change datetime.datetime.now to half-even rounding (#134258)

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Change `datetime.datetime.now` to half-even rounding
for consistency with `datetime.fromtimestamp`.
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John Keith Hohm 2025-05-19 16:48:55 -04:00 • committed by GitHub
parent 42d03f3933
commit 470941782f
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3 changed files with 6 additions and 1 deletions
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Misc/ACKS
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@ -795,6 +795,7 @@ Albert Hofkamp
Chris Hogan Chris Hogan
Tomas Hoger Tomas Hoger
Jonathan Hogg Jonathan Hogg
John Keith Hohm
Vladyslav Hoi Vladyslav Hoi
Kamilla Holanda Kamilla Holanda
Steve Holden Steve Holden

3
Misc/NEWS.d/next/Library/2025-05-19-18-12-42.gh-issue-88994.7avvVu.rst Normal file
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@ -0,0 +1,3 @@
Change :func:`datetime.datetime.now` to half-even rounding for
consistency with :func:`datetime.datetime.fromtimestamp`. Patch by
John Keith Hohm.

3
Modules/_datetimemodule.c
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@ -5551,8 +5551,9 @@ datetime_best_possible(PyObject *cls, TM_FUNC f, PyObject *tzinfo)
time_t secs; time_t secs;
int us; int us;
if (_PyTime_AsTimevalTime_t(ts, &secs, &us, _PyTime_ROUND_FLOOR) < 0) if (_PyTime_AsTimevalTime_t(ts, &secs, &us, _PyTime_ROUND_HALF_EVEN) < 0) {
return NULL; return NULL;
}
assert(0 <= us && us <= 999999); assert(0 <= us && us <= 999999);
return datetime_from_timet_and_us(cls, f, secs, us, tzinfo); return datetime_from_timet_and_us(cls, f, secs, us, tzinfo);