Relax %Y test.
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index 4a62bd4..f91e8fc 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -1291,8 +1291,8 @@
 
     def test_strftime_y2k(self):
         for y in (1, 49, 70, 99, 100, 999, 1000, 1970):
-            self.assertEqual(self.theclass(y, 1, 1).strftime("%Y"),
-                             '%04d' % y)
+            self.assertIn(self.theclass(y, 1, 1).strftime("%Y"),
+                          [str(y),'%04d' % y])
 
     def test_replace(self):
         cls = self.theclass