diff --git a/django/contrib/sessions/backends/base.py b/django/contrib/sessions/backends/base.py
index 920b3e68cd..4ddb35a832 100644
--- a/django/contrib/sessions/backends/base.py
+++ b/django/contrib/sessions/backends/base.py
@@ -12,6 +12,7 @@ except ImportError:
 from django.conf import settings
 from django.core.exceptions import SuspiciousOperation
 from django.utils.crypto import constant_time_compare, salted_hmac
+from django.utils import timezone
 
 # Use the system (hardware-based) random number generator if it exists.
 if hasattr(random, 'SystemRandom'):
@@ -188,7 +189,7 @@ class SessionBase(object):
             return settings.SESSION_COOKIE_AGE
         if not isinstance(expiry, datetime):
             return expiry
-        delta = expiry - datetime.now()
+        delta = expiry - timezone.now()
         return delta.days * 86400 + delta.seconds
 
     def get_expiry_date(self):
@@ -198,7 +199,7 @@ class SessionBase(object):
             return expiry
         if not expiry:   # Checks both None and 0 cases
             expiry = settings.SESSION_COOKIE_AGE
-        return datetime.now() + timedelta(seconds=expiry)
+        return timezone.now() + timedelta(seconds=expiry)
 
     def set_expiry(self, value):
         """
@@ -223,7 +224,7 @@ class SessionBase(object):
                 pass
             return
         if isinstance(value, timedelta):
-            value = datetime.now() + value
+            value = timezone.now() + value
         self['_session_expiry'] = value
 
     def get_expire_at_browser_close(self):
diff --git a/django/contrib/sessions/backends/db.py b/django/contrib/sessions/backends/db.py
index 220046fefb..7d4c535fd4 100644
--- a/django/contrib/sessions/backends/db.py
+++ b/django/contrib/sessions/backends/db.py
@@ -1,8 +1,8 @@
-import datetime
 from django.contrib.sessions.backends.base import SessionBase, CreateError
 from django.core.exceptions import SuspiciousOperation
 from django.db import IntegrityError, transaction, router
 from django.utils.encoding import force_unicode
+from django.utils import timezone
 
 
 class SessionStore(SessionBase):
@@ -16,7 +16,7 @@ class SessionStore(SessionBase):
         try:
             s = Session.objects.get(
                 session_key = self.session_key,
-                expire_date__gt=datetime.datetime.now()
+                expire_date__gt=timezone.now()
             )
             return self.decode(force_unicode(s.session_data))
         except (Session.DoesNotExist, SuspiciousOperation):
diff --git a/django/contrib/sessions/tests.py b/django/contrib/sessions/tests.py
index 776e03c081..ce39fef0ad 100644
--- a/django/contrib/sessions/tests.py
+++ b/django/contrib/sessions/tests.py
@@ -16,6 +16,7 @@ from django.core.exceptions import ImproperlyConfigured, SuspiciousOperation
 from django.http import HttpResponse
 from django.test import TestCase, RequestFactory
 from django.test.utils import override_settings
+from django.utils import timezone
 from django.utils import unittest
 
 
@@ -187,7 +188,7 @@ class SessionTestsMixin(object):
     def test_custom_expiry_seconds(self):
         # Using seconds
         self.session.set_expiry(10)
-        delta = self.session.get_expiry_date() - datetime.now()
+        delta = self.session.get_expiry_date() - timezone.now()
         self.assertTrue(delta.seconds in (9, 10))
 
         age = self.session.get_expiry_age()
@@ -196,7 +197,7 @@ class SessionTestsMixin(object):
     def test_custom_expiry_timedelta(self):
         # Using timedelta
         self.session.set_expiry(timedelta(seconds=10))
-        delta = self.session.get_expiry_date() - datetime.now()
+        delta = self.session.get_expiry_date() - timezone.now()
         self.assertTrue(delta.seconds in (9, 10))
 
         age = self.session.get_expiry_age()
@@ -204,8 +205,8 @@ class SessionTestsMixin(object):
 
     def test_custom_expiry_datetime(self):
         # Using fixed datetime
-        self.session.set_expiry(datetime.now() + timedelta(seconds=10))
-        delta = self.session.get_expiry_date() - datetime.now()
+        self.session.set_expiry(timezone.now() + timedelta(seconds=10))
+        delta = self.session.get_expiry_date() - timezone.now()
         self.assertTrue(delta.seconds in (9, 10))
 
         age = self.session.get_expiry_age()
@@ -279,10 +280,17 @@ class DatabaseSessionTests(SessionTestsMixin, TestCase):
         self.assertEqual(self.session['y'], 2)
 
 
+DatabaseSessionWithTimeZoneTests = override_settings(USE_TZ=True)(DatabaseSessionTests)
+
+
 class CacheDBSessionTests(SessionTestsMixin, TestCase):
 
     backend = CacheDBSession
 
+
+CacheDBSessionWithTimeZoneTests = override_settings(USE_TZ=True)(CacheDBSessionTests)
+
+
 # Don't need DB flushing for these tests, so can use unittest.TestCase as base class
 class FileSessionTests(SessionTestsMixin, unittest.TestCase):