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):
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index e9ceee6..38f3b8f 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -383,6 +383,12 @@
for i in range(-10, 10):
eq((i*us/-3)//us, round(i/-3))
+ # Issue #11576
+ eq(td(999999999, 86399, 999999) - td(999999999, 86399, 999998),
+ td(0, 0, 1))
+ eq(td(999999999, 1, 1) - td(999999999, 1, 0),
+ td(0, 0, 1))
+
def test_disallowed_computations(self):
a = timedelta(42)