Issue #23517: fromtimestamp() and utcfromtimestamp() methods of

datetime.datetime now round microseconds to nearest with ties going away from
zero (ROUND_HALF_UP), as Python 2 and Python older than 3.3, instead of
rounding towards -Infinity (ROUND_FLOOR).

1 files changed, 2 insertions, 2 deletions

diff --git a/Lib/datetime.py b/Lib/datetime.py
index d661460..5ba2ddb 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -1384,7 +1384,7 @@ class datetime(date):
         converter = _time.localtime if tz is None else _time.gmtime
 
         t, frac = divmod(t, 1.0)
-        us = int(frac * 1e6)
+        us = _round_half_up(frac * 1e6)
 
         # If timestamp is less than one microsecond smaller than a
         # full second, us can be rounded up to 1000000.  In this case,
@@ -1404,7 +1404,7 @@ class datetime(date):
     def utcfromtimestamp(cls, t):
         """Construct a naive UTC datetime from a POSIX timestamp."""
         t, frac = divmod(t, 1.0)
-        us = int(frac * 1e6)
+        us = _round_half_up(frac * 1e6)
 
         # If timestamp is less than one microsecond smaller than a
         # full second, us can be rounded up to 1000000.  In this case,