Fix datetime and its test.
diff --git a/Lib/test/test_datetime.py b/Lib/test/test_datetime.py
index 4ab2f7b..89c126f 100644
--- a/Lib/test/test_datetime.py
+++ b/Lib/test/test_datetime.py
@@ -1098,7 +1098,8 @@
             # This shouldn't blow up because of the month byte alone.  If
             # the implementation changes to do more-careful checking, it may
             # blow up because other fields are insane.
-            self.theclass(base[:2] + chr(ord_byte) + base[3:])
+            # XXX Maybe this will have to become bytes?
+            self.theclass(str8(base[:2] + chr(ord_byte) + base[3:]))
 
 #############################################################################
 # datetime tests