diff --git a/zaqar/storage/mongodb/utils.py b/zaqar/storage/mongodb/utils.py
index 2be8a323a..600dde443 100644
--- a/zaqar/storage/mongodb/utils.py
+++ b/zaqar/storage/mongodb/utils.py
@@ -133,11 +133,12 @@ def stat_message(message, now):
     msg_id = message['id']
     created = oid_ts(to_oid(msg_id))
     age = now - created
-
+    created_iso = datetime.datetime.utcfromtimestamp(created).strftime(
+        '%Y-%m-%dT%H:%M:%SZ')
     return {
         'id': msg_id,
         'age': int(age),
-        'created': timeutils.iso8601_from_timestamp(created),
+        'created': created_iso,
     }
 
 
diff --git a/zaqar/storage/redis/models.py b/zaqar/storage/redis/models.py
index 71400826a..1ec505d19 100644
--- a/zaqar/storage/redis/models.py
+++ b/zaqar/storage/redis/models.py
@@ -14,12 +14,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import datetime
 import functools
 import uuid
 
 import msgpack
 from oslo_utils import encodeutils
-from oslo_utils import timeutils
 from oslo_utils import uuidutils
 
 MSGENV_FIELD_KEYS = (b'id', b't', b'cr', b'e', b'u', b'c', b'c.e', b'c.c')
@@ -232,7 +232,8 @@ class Message(MessageEnvelope):
         }
 
         if include_created:
-            created_iso = timeutils.iso8601_from_timestamp(self.created)
+            created_iso = datetime.datetime.utcfromtimestamp(
+                self.created).strftime('%Y-%m-%dT%H:%M:%SZ')
             basic_msg['created'] = created_iso
 
         return basic_msg
diff --git a/zaqar/storage/swift/messages.py b/zaqar/storage/swift/messages.py
index f6aba9004..0151c1f18 100644
--- a/zaqar/storage/swift/messages.py
+++ b/zaqar/storage/swift/messages.py
@@ -12,6 +12,7 @@
 # limitations under the License.
 
 import copy
+import datetime
 import functools
 import uuid
 
@@ -341,10 +342,12 @@ class MessageQueueHandler(object):
                     raise
             else:
                 created = float(headers['x-timestamp'])
+                created_iso = datetime.datetime.utcfromtimestamp(
+                    created).strftime('%Y-%m-%dT%H:%M:%SZ')
                 newest = {
                     'id': obj['name'],
                     'age': now - created,
-                    'created': timeutils.iso8601_from_timestamp(created)}
+                    'created': created_iso}
                 if oldest is None:
                     oldest = copy.deepcopy(newest)
                 total += 1