Fixed Python2.6 incompatibility caused by 67c30426c1.

tests/datetimes/tests.py

@@ -1,7 +1,6 @@
 from __future__ import absolute_import
 
 import datetime
-from unittest import skipIf
 
 try:
     import pytz
@@ -11,6 +10,7 @@ except ImportError:
 from django.test import TestCase
 from django.test.utils import override_settings
 from django.utils import timezone
+from django.utils.unittest import skipIf
 
 
 from .models import Article, Comment, Category