diff --git a/almanach/tests/tempest/tests/api/test_volume_deletion.py b/almanach/tests/tempest/tests/api/test_volume_deletion.py
index 6027c08..3490db9 100644
--- a/almanach/tests/tempest/tests/api/test_volume_deletion.py
+++ b/almanach/tests/tempest/tests/api/test_volume_deletion.py
@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import datetime
 from oslo_serialization import jsonutils as json
 from oslo_utils import timeutils
 
@@ -28,7 +29,7 @@ class TestVolumeDeletion(base.BaseAlmanachTest):
         resp, tenant_id, volume = self.create_volume()
         self.assertEqual(resp.status, 201)
 
-        delete_body = {'date': timeutils.isotime()}
+        delete_body = {'date': datetime.datetime.isoformat(timeutils.utcnow())}
         resp, _ = self.almanach_client.delete_volume(volume['volume_id'], json.dumps(delete_body))
         self.assertEqual(resp.status, 202)