diff --git a/api-ref/source/samples/container-action-get-resp.json b/api-ref/source/samples/container-action-get-resp.json
index b1555f8e5..2077c1ea3 100644
--- a/api-ref/source/samples/container-action-get-resp.json
+++ b/api-ref/source/samples/container-action-get-resp.json
@@ -3,9 +3,9 @@
     "events": [
         {
           "event": "container__do_container_start",
-          "finish_time": "2018-03-04 17:03:07+00:00",
+          "finish_time": "2018-03-04T17:03:07.000000",
           "result": "Success",
-          "start_time": "2018-03-04 17:02:57+00:00",
+          "start_time": "2018-03-04T17:02:57.000000",
           "traceback": null
         }
     ],
@@ -13,6 +13,6 @@
     "message": null,
     "project_id": "853719b303ef4858a195535eb520e58d",
     "request_id": "req-3293a3f1-b44c-4609-b8d2-d81b105636b8",
-    "start_time": "2018-03-04 17:02:54+00:00",
+    "start_time": "2018-03-04T17:02:54.000000",
     "user_id": "22e81669093742b7a74b1d715a9a5813"
 }
diff --git a/api-ref/source/samples/container-actions-list-resp.json b/api-ref/source/samples/container-actions-list-resp.json
index d8591fbc5..5a8f8f9b5 100644
--- a/api-ref/source/samples/container-actions-list-resp.json
+++ b/api-ref/source/samples/container-actions-list-resp.json
@@ -6,7 +6,7 @@
             "message": null,
             "project_id": "853719b303ef4858a195535eb520e58d",
             "request_id": "req-25517360-b757-47d3-be45-0e8d2a01b36a",
-            "start_time": "2018-03-04 19:48:49+00:00",
+            "start_time": "2018-03-04T19:48:49.000000",
             "user_id": "22e81669093742b7a74b1d715a9a5813"
         },
         {
@@ -15,7 +15,7 @@
             "message": null,
             "project_id": "853719b303ef4858a195535eb520e58d",
             "request_id": "req-3293a3f1-b44c-4609-b8d2-d81b105636b8",
-            "start_time": "2018-03-04 17:02:54+00:00",
+            "start_time": "2018-03-04T17:02:54.000000",
             "user_id": "22e81669093742b7a74b1d715a9a5813"
         }
     ]
diff --git a/api-ref/source/samples/service-get-resp.json b/api-ref/source/samples/service-get-resp.json
index 9e087367a..a481f8072 100644
--- a/api-ref/source/samples/service-get-resp.json
+++ b/api-ref/source/samples/service-get-resp.json
@@ -4,13 +4,13 @@
             "binary": "zun-compute",
             "availability_zone": "nova",
             "state": "up",
-            "created_at": "2017-02-01 03:25:07+00:00",
-            "updated_at": "2017-02-01 06:13:07+00:00",
+            "created_at": "2017-02-01T03:25:07.000000",
+            "updated_at": "2017-02-01T06:13:07.000000",
             "report_count": 166,
             "disabled": false,
             "host": "instance-1",
             "forced_down": false,
-            "last_seen_up": "2017-02-01 06:13:07+00:00",
+            "last_seen_up": "2017-02-01T06:13:07.000000",
             "disabled_reason": null,
             "id": 1
         }
diff --git a/zun/api/controllers/v1/views/actions_view.py b/zun/api/controllers/v1/views/actions_view.py
index ac40828fd..cb7a7e62d 100644
--- a/zun/api/controllers/v1/views/actions_view.py
+++ b/zun/api/controllers/v1/views/actions_view.py
@@ -11,8 +11,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import datetime
 import itertools
 
+from zun.common import utils
+
 
 _action_keys = (
     'action',
@@ -39,7 +42,10 @@ def format_action(action):
         if key not in _action_keys:
             return
 
-        yield (key, value)
+        if isinstance(value, datetime.datetime):
+            yield (key, utils.strtime(value))
+        else:
+            yield (key, value)
 
     return dict(itertools.chain.from_iterable(
         transform(k, v) for k, v in action.as_dict().items()))
@@ -50,11 +56,15 @@ def format_event(event, show_traceback=False):
         if key not in _action_event_keys:
             return
 
-        if key == 'traceback' and not show_traceback:
-            # By default, non-admins are not allowed to see traceback details.
-            yield (key, None)
+        if isinstance(value, datetime.datetime):
+            yield (key, utils.strtime(value))
         else:
-            yield (key, value)
+            if key == 'traceback' and not show_traceback:
+                # By default, non-admins are not allowed to see traceback
+                # details.
+                yield (key, None)
+            else:
+                yield (key, value)
 
     return dict(itertools.chain.from_iterable(
         transform(k, v) for k, v in event.as_dict().items()))
diff --git a/zun/api/controllers/v1/views/services_view.py b/zun/api/controllers/v1/views/services_view.py
index ea84c2ccd..901533911 100644
--- a/zun/api/controllers/v1/views/services_view.py
+++ b/zun/api/controllers/v1/views/services_view.py
@@ -11,8 +11,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import datetime
 import itertools
 
+from zun.common import utils
+
 
 _basic_keys = (
     'availability_zone',
@@ -34,7 +37,10 @@ def format_service(service):
     def transform(key, value):
         if key not in _basic_keys:
             return
-        yield (key, value)
+        if isinstance(value, datetime.datetime):
+            yield (key, utils.strtime(value))
+        else:
+            yield (key, value)
 
     return dict(
         itertools.chain.from_iterable(
diff --git a/zun/common/utils.py b/zun/common/utils.py
index 0e4b8eb0c..44872ca98 100644
--- a/zun/common/utils.py
+++ b/zun/common/utils.py
@@ -685,3 +685,7 @@ def decode_file_data(data):
         return base64.b64decode(data)
     except (TypeError, binascii.Error):
         raise exception.Base64Exception()
+
+
+def strtime(at):
+    return at.strftime("%Y-%m-%dT%H:%M:%S.%f")