STINNER Victor added the comment:
I started a large change set to support nanoseconds in the C "pytime" API: see
the issue #22117. While working on this change, I noticed that the rounding
mode of datetime is currently wrong. Extract of a private patch:
typedef enum {
/* Round towards zero. */
_PyTime_ROUND_DOWN=0,
/* Round away from zero.
For example, used for timeout to wait "at least" N seconds. */
_PyTime_ROUND_UP=1,
/* Round towards minus infinity (-inf).
For example, used for the system clock with UNIX epoch (time_t). */
_PyTime_ROUND_FLOOR=2
} _PyTime_round_t;
I changed Modules/_datetimemodule.c to use _PyTime_ROUND_FLOOR, instead of
_PyTime_ROUND_DOWN.
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<http://bugs.python.org/issue23517>
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