From 4ea42eba4d73ff448fd81edf438e38d33d00db57 Mon Sep 17 00:00:00 2001 From: Kadir Can Ozden <101993364+bysiber@users.noreply.github.com> Date: 2026年2月20日 14:59:16 +0300 Subject: [PATCH] Fix Timestamp.from_datetime returning wrong value for pre-epoch times int() truncates towards zero, so for pre-epoch datetimes with non-zero microseconds the seconds component gets the wrong value. For example, datetime(1969, 12, 31, 23, 59, 59, 500000, UTC) has timestamp -0.5, but int(-0.5) == 0, producing Timestamp(0, 500000000) (+0.5s after epoch) instead of Timestamp(-1, 500000000) (-0.5s before epoch). Use floor division (// 1) instead, consistent with from_unix(). --- msgpack/ext.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/msgpack/ext.py b/msgpack/ext.py index 9694819a..92ea4530 100644 --- a/msgpack/ext.py +++ b/msgpack/ext.py @@ -167,4 +167,4 @@ def from_datetime(dt): :rtype: Timestamp """ - return Timestamp(seconds=int(dt.timestamp()), nanoseconds=dt.microsecond * 1000) + return Timestamp(seconds=int(dt.timestamp() // 1), nanoseconds=dt.microsecond * 1000)

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