Issue #11576: Fixed timedelta subtraction glitch on big timedelta values
diff --git a/Lib/datetime.py b/Lib/datetime.py
index 47e54ec..1ae7cb5 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -485,7 +485,11 @@
def __sub__(self, other):
if isinstance(other, timedelta):
- return self + -other
+ # for CPython compatibility, we cannot use
+ # our __class__ here, but need a real timedelta
+ return timedelta(self._days - other._days,
+ self._seconds - other._seconds,
+ self._microseconds - other._microseconds)
return NotImplemented
def __rsub__(self, other):