creation_time to use utc timestamp for metrics and events

Change-Id: I7862f0a0e268dabe62a9da0700965cef17dc1fe0

monasca/common/messaging/message_formats/reference/events.py

@@ -12,7 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import datetime
+from oslo_utils import timeutils
 
 
 def transform(event, tenant_id, region):
@@ -22,7 +22,7 @@ def transform(event, tenant_id, region):
             tenantId=tenant_id,
             region=region
         ),
-        creation_time=datetime.now()
+        creation_time=timeutils.utcnow_ts()
     )
 
     return transformed_event

monasca/common/messaging/message_formats/reference/metrics.py

@@ -12,13 +12,13 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import datetime
+from oslo_utils import timeutils
 
 
 def transform(metrics, tenant_id, region):
     transformed_metric = {'metric': {},
                           'meta': {'tenantId': tenant_id, 'region': region},
-                          'creation_time': datetime.now()}
+                          'creation_time': timeutils.utcnow_ts()}
 
     if isinstance(metrics, list):
         transformed_metrics = []

requirements.txt

@@ -26,6 +26,7 @@ keystonemiddleware
 oslo.config>=1.2.1
 oslo.middleware
 oslo.serialization
+oslo.utils
 pastedeploy>=1.3.3
 pbr>=0.6,!=0.7,<1.0
 python-dateutil>=1.5