Issue #11576: Fixed timedelta subtraction glitch on big timedelta values
diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c
index 6195940..6ee5317 100644
--- a/Modules/_datetimemodule.c
+++ b/Modules/_datetimemodule.c
@@ -1801,13 +1801,14 @@
if (PyDelta_Check(left) && PyDelta_Check(right)) {
/* delta - delta */
- PyObject *minus_right = PyNumber_Negative(right);
- if (minus_right) {
- result = delta_add(left, minus_right);
- Py_DECREF(minus_right);
- }
- else
- result = NULL;
+ /* The C-level additions can't overflow because of the
+ * invariant bounds.
+ */
+ int days = GET_TD_DAYS(left) - GET_TD_DAYS(right);
+ int seconds = GET_TD_SECONDS(left) - GET_TD_SECONDS(right);
+ int microseconds = GET_TD_MICROSECONDS(left) -
+ GET_TD_MICROSECONDS(right);
+ result = new_delta(days, seconds, microseconds, 1);
}
if (result == Py_NotImplemented)