From b6f5ec737008f5c739ba3c667e1ae01b8625488b Mon Sep 17 00:00:00 2001
From: Alexander Belopolsky <alexander.belopolsky@gmail.com>
Date: Tue, 5 Apr 2011 20:07:38 -0400
Subject: Issue #11576: Fixed timedelta subtraction glitch on big timedelta
 values

---
 Lib/datetime.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'Lib/datetime.py')

diff --git a/Lib/datetime.py b/Lib/datetime.py
index 47e54ec235..1ae7cb5305 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -485,7 +485,11 @@ class timedelta:
 
     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):
-- 
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