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-rw-r--r--Lib/logging/__init__.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index 174b37c..3f41442 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -340,11 +340,14 @@ class LogRecord(object):
self.lineno = lineno
self.funcName = func
self.created = ct / 1e9 # ns to float seconds
-
# Get the number of whole milliseconds (0-999) in the fractional part of seconds.
# Eg: 1_677_903_920_999_998_503 ns --> 999_998_503 ns--> 999 ms
# Convert to float by adding 0.0 for historical reasons. See gh-89047
self.msecs = (ct % 1_000_000_000) // 1_000_000 + 0.0
+ if self.msecs == 999.0 and int(self.created) != ct // 1_000_000_000:
+ # ns -> sec conversion can round up, e.g:
+ # 1_677_903_920_999_999_900 ns --> 1_677_903_921.0 sec
+ self.msecs = 0.0
self.relativeCreated = (ct - _startTime) / 1e6
if logThreads: