diff --git a/keystone/tests/unit/core.py b/keystone/tests/unit/core.py
index 732da590a9..598ed20370 100644
--- a/keystone/tests/unit/core.py
+++ b/keystone/tests/unit/core.py
@@ -823,6 +823,17 @@ class TestCase(BaseTestCase):
 
         self.assertTrue(abs(a - b).seconds <= delta, msg)
 
+    def assertTimestampEqual(self, expected, value):
+        # Compare two timestamps but ignore the microseconds part
+        # of the expected timestamp. Keystone does not track microseconds and
+        # is working to eliminate microseconds from it's datetimes used.
+        expected = timeutils.parse_isotime(expected).replace(microsecond=0)
+        value = timeutils.parse_isotime(value).replace(microsecond=0)
+        self.assertEqual(
+            expected,
+            value,
+            "%s != %s" % (expected, value))
+
     def assertNotEmpty(self, l):
         self.assertTrue(len(l))
 
diff --git a/keystone/tests/unit/test_v3_auth.py b/keystone/tests/unit/test_v3_auth.py
index a0c251ad7d..88af10d3ea 100644
--- a/keystone/tests/unit/test_v3_auth.py
+++ b/keystone/tests/unit/test_v3_auth.py
@@ -245,17 +245,6 @@ class TokenAPITests(object):
 
         return project
 
-    def assertTimestampEqual(self, expected, value):
-        # Compare two timestamps but ignore the microseconds part
-        # of the expected timestamp. Keystone does not track microseconds and
-        # is working to eliminate microseconds from it's datetimes used.
-        expected = timeutils.parse_isotime(expected).replace(microsecond=0)
-        value = timeutils.parse_isotime(value).replace(microsecond=0)
-        self.assertEqual(
-            expected,
-            value,
-            "%s != %s" % (expected, value))
-
     def test_auth_with_token_as_different_user_fails(self):
         # get the token for a user. This is self.user which is different from
         # self.default_domain_user.
diff --git a/keystone/tests/unit/test_v3_os_revoke.py b/keystone/tests/unit/test_v3_os_revoke.py
index 4a74026d52..502fe1c9e1 100644
--- a/keystone/tests/unit/test_v3_os_revoke.py
+++ b/keystone/tests/unit/test_v3_os_revoke.py
@@ -38,20 +38,6 @@ class OSRevokeTests(test_v3.RestfulTestCase, test_v3.JsonHomeTestMixin):
         },
     }
 
-    # TODO(davechen): This method is copied from `keystone.tests.unit.
-    # test_v3_auth.TokenAPITests`, move this method into utils.py to avoid
-    # the duplication?
-    def assertTimestampEqual(self, expected, value):
-        # Compare two timestamps but ignore the microseconds part
-        # of the expected timestamp. Keystone does not track microseconds and
-        # is working to eliminate microseconds from it's datetimes used.
-        expected = timeutils.parse_isotime(expected).replace(microsecond=0)
-        value = timeutils.parse_isotime(value).replace(microsecond=0)
-        self.assertEqual(
-            expected,
-            value,
-            "%s != %s" % (expected, value))
-
     def test_get_empty_list(self):
         resp = self.get('/OS-REVOKE/events')
         self.assertEqual([], resp.json_body['events'])