From 46735add5fd292d1c0141aefa23f92814b15cac3 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Mon, 9 Oct 2000 12:42:04 +0000
Subject: Fixed leapdays().  From Patch #101841, by Denis S. Otkidach.

---
 Lib/calendar.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/calendar.py b/Lib/calendar.py
index 8ac71f1..41bb191 100644
--- a/Lib/calendar.py
+++ b/Lib/calendar.py
@@ -54,8 +54,10 @@ def isleap(year):
 
 def leapdays(y1, y2):
     """Return number of leap years in range [y1, y2).
-       Assume y1 <= y2 and no funny (non-leap century) years."""
-    return (y2+3)/4 - (y1+3)/4
+       Assume y1 <= y2."""
+    y1 -= 1
+    y2 -= 1
+    return (y2/4 - y1/4) - (y2/100 - y1/100) + (y2/400 - y1/400)
 
 def weekday(year, month, day):
     """Return weekday (0-6 ~ Mon-Sun) for year (1970-...), month (1-12),
-- 
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