Close #14180: Factorize code to convert a number of seconds to time_t, timeval or timespec

time.ctime(), gmtime(), time.localtime(), datetime.date.fromtimestamp(),
datetime.datetime.fromtimestamp() and datetime.datetime.utcfromtimestamp() now
raises an OverflowError, instead of a ValueError, if the timestamp does not fit
in time_t.

datetime.datetime.fromtimestamp() and datetime.datetime.utcfromtimestamp() now
round microseconds towards zero instead of rounding to nearest with ties going
away from zero.

1 files changed, 2 insertions, 2 deletions

diff --git a/Lib/datetime.py b/Lib/datetime.py
index c5eeca4a3f..59f3c68788 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -1360,7 +1360,7 @@ class datetime(date):
         converter = _time.localtime if tz is None else _time.gmtime
 
         t, frac = divmod(t, 1.0)
-        us = round(frac * 1e6)
+        us = int(frac * 1e6)
 
         # If timestamp is less than one microsecond smaller than a
         # full second, us can be rounded up to 1000000.  In this case,
@@ -1380,7 +1380,7 @@ class datetime(date):
     def utcfromtimestamp(cls, t):
         "Construct a UTC datetime from a POSIX timestamp (like time.time())."
         t, frac = divmod(t, 1.0)
-        us = round(frac * 1e6)
+        us = int(frac * 1e6)
 
         # If timestamp is less than one microsecond smaller than a
         # full second, us can be rounded up to 1000000.  In this case,