Index: Modules/datetimemodule.c
===================================================================
--- Modules/datetimemodule.c	(revision 82577)
+++ Modules/datetimemodule.c	(working copy)
@@ -238,16 +238,10 @@
     int y = year - 1;
     /* This is incorrect if year <= 0; we really want the floor
      * here.  But so long as MINYEAR is 1, the smallest year this
-     * can see is 0 (this can happen in some normalization endcases),
-     * so we'll just special-case that.
+     * can see is 1.
      */
-    assert (year >= 0);
-    if (y >= 0)
-        return y*365 + y/4 - y/100 + y/400;
-    else {
-        assert(y == -1);
-        return -366;
-    }
+    assert (year >= 1);
+    return y*365 + y/4 - y/100 + y/400;
 }
 
 /* Number of days in 4, 100, and 400 year cycles.  That these have