Fix CourseOverview factory timezone unawareness warnings

openedx/core/djangoapps/content/course_overviews/tests/factories.py

@@ -1,8 +1,9 @@
 from __future__ import absolute_import
 
-from datetime import datetime, timedelta
+from datetime import timedelta
 import json
 
+from django.utils import timezone
 import factory
 from factory.django import DjangoModelFactory
 from opaque_keys.edx.locator import CourseLocator
@@ -39,8 +40,8 @@ class CourseOverviewFactory(DjangoModelFactory):
 
     @factory.lazy_attribute
     def start(self):
-        return datetime.now()
+        return timezone.now()
 
     @factory.lazy_attribute
     def end(self):
-        return datetime.now() + timedelta(30)
+        return timezone.now() + timedelta(30)