diff --git a/vitrage/datasources/nagios/transformer.py b/vitrage/datasources/nagios/transformer.py
index 3f4025a05..3650cda52 100644
--- a/vitrage/datasources/nagios/transformer.py
+++ b/vitrage/datasources/nagios/transformer.py
@@ -40,7 +40,6 @@ class NagiosTransformer(AlarmTransformerBase):
 
         update_timestamp = datetime_utils.change_to_utc_time_and_format(
             entity_event[NagiosProperties.LAST_CHECK],
-            '%Y-%m-%d %H:%M:%S',
             tbase.TIMESTAMP_FORMAT)
         vitrage_sample_timestamp = entity_event[DSProps.SAMPLE_DATE]
         update_timestamp = \
diff --git a/vitrage/tests/unit/datasources/nagios/test_nagios_transformer.py b/vitrage/tests/unit/datasources/nagios/test_nagios_transformer.py
index 1357cf80a..9de7070a6 100644
--- a/vitrage/tests/unit/datasources/nagios/test_nagios_transformer.py
+++ b/vitrage/tests/unit/datasources/nagios/test_nagios_transformer.py
@@ -134,7 +134,6 @@ class NagiosTransformerTest(base.BaseTest):
         self.assertEqual(event[NagiosProperties.SERVICE], vertex[VProps.NAME])
         self.assertEqual(datetime_utils.change_to_utc_time_and_format(
             event[NagiosProperties.LAST_CHECK],
-            '%Y-%m-%d %H:%M:%S',
             tbase.TIMESTAMP_FORMAT),
             vertex[VProps.UPDATE_TIMESTAMP])
         event_type = event.get(DSProps.EVENT_TYPE, None)
diff --git a/vitrage/utils/datetime.py b/vitrage/utils/datetime.py
index 8ebd27ae1..1af364b3f 100644
--- a/vitrage/utils/datetime.py
+++ b/vitrage/utils/datetime.py
@@ -16,6 +16,7 @@ from __future__ import absolute_import
 
 from datetime import datetime
 from datetime import timedelta
+from dateutil import parser
 from oslo_utils import timeutils
 
 
@@ -32,8 +33,8 @@ def change_time_str_format(timestamp_str, old_format, new_format):
     return utc.strftime(new_format)
 
 
-def change_to_utc_time_and_format(timestamp_str, old_format, new_format):
-    timestamp = datetime.strptime(timestamp_str, old_format)
+def change_to_utc_time_and_format(timestamp_str, new_format):
+    timestamp = parser.parse(timestamp_str)
     timestamp = timestamp - timedelta(seconds=(
         datetime.now() - datetime.utcnow()).total_seconds())
     return timestamp.strftime(new_format)