diff --git a/lower-constraints.txt b/lower-constraints.txt
index 590961738..44f5e3937 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -102,7 +102,7 @@ python-novaclient==10.1.0
 python-openstackclient==3.12.0
 python-subunit==1.2.0
 python-swiftclient==3.5.0
-pytz==2018.3
+pytz==2013.6
 PyYAML==3.12
 pyzabbix==0.7.4
 reno==2.7.0
diff --git a/requirements.txt b/requirements.txt
index 90f4a21fa..4407e2714 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,3 +47,4 @@ six>=1.11.0 # MIT
 debtcollector>=1.19.0 # Apache-2.0
 cotyledon>=1.6.8 # Apache-2.0
 futures>=3.0.0;python_version=='2.7' or python_version=='2.6'  # BSD
+pytz>=2013.6 # MIT
\ No newline at end of file
diff --git a/vitrage/api_handler/apis/alarm.py b/vitrage/api_handler/apis/alarm.py
index f9fe79533..0a69bcf4a 100755
--- a/vitrage/api_handler/apis/alarm.py
+++ b/vitrage/api_handler/apis/alarm.py
@@ -11,10 +11,9 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
-
-
 from dateutil import parser
 import json
+
 from oslo_log import log
 from osprofiler import profiler
 
@@ -107,9 +106,14 @@ class AlarmApis(EntityGraphApisBase):
                     alarm.payload[VProps.VITRAGE_OPERATIONAL_SEVERITY] = \
                         OperationalAlarmSeverity.OK
         for alarm in alarms:
-            alarm.payload[HProps.START_TIMESTAMP] = str(alarm.start_timestamp)
+            start_timestamp = \
+                self.db.history_facade.add_utc_timezone(alarm.start_timestamp)
+            alarm.payload[HProps.START_TIMESTAMP] = str(start_timestamp)
             if alarm.end_timestamp <= db_time():
-                alarm.payload[HProps.END_TIMESTAMP] = str(alarm.end_timestamp)
+                end_timestamp = \
+                    self.db.history_facade.add_utc_timezone(
+                        alarm.end_timestamp)
+                alarm.payload[HProps.END_TIMESTAMP] = str(end_timestamp)
 
         return alarms
 
diff --git a/vitrage/api_handler/apis/rca.py b/vitrage/api_handler/apis/rca.py
index 56c789c66..ef2404f77 100644
--- a/vitrage/api_handler/apis/rca.py
+++ b/vitrage/api_handler/apis/rca.py
@@ -51,9 +51,13 @@ class RcaApis(EntityGraphApisBase):
                 admin=is_admin_project)
 
         for n in db_nodes:
-            n.payload[HProps.START_TIMESTAMP] = str(n.start_timestamp)
+            start_timestamp = \
+                self.db.history_facade.add_utc_timezone(n.start_timestamp)
+            n.payload[HProps.START_TIMESTAMP] = str(start_timestamp)
             if n.end_timestamp <= db_time():
-                n.payload[HProps.END_TIMESTAMP] = str(n.end_timestamp)
+                end_timestamp = \
+                    self.db.history_facade.add_utc_timezone(n.end_timestamp)
+                n.payload[HProps.END_TIMESTAMP] = str(end_timestamp)
 
         vertices = [Vertex(vertex_id=n.vitrage_id, properties=n.payload) for n
                     in db_nodes]
diff --git a/vitrage/storage/history_facade.py b/vitrage/storage/history_facade.py
index cfd534953..f7f489479 100644
--- a/vitrage/storage/history_facade.py
+++ b/vitrage/storage/history_facade.py
@@ -14,12 +14,15 @@
 
 from __future__ import absolute_import
 
-from oslo_db.sqlalchemy import utils as sqlalchemyutils
-from oslo_log import log
-from oslo_utils import timeutils
+import pytz
 import sqlalchemy
 from sqlalchemy import and_
 from sqlalchemy import or_
+
+from oslo_db.sqlalchemy import utils as sqlalchemyutils
+from oslo_log import log
+from oslo_utils import timeutils
+
 from vitrage.common.constants import EdgeLabel as ELable
 from vitrage.common.constants import HistoryProps as HProps
 from vitrage.common.exception import VitrageInputError
@@ -51,6 +54,11 @@ class HistoryFacadeConnection(object):
         self._edges.end_all_edges(end_time)
         self._changes.add_end_changes(changes_to_add, end_time)
 
+    @staticmethod
+    def add_utc_timezone(time):
+        time = pytz.utc.localize(time)
+        return time
+
     def count_active_alarms(self, project_id=None, is_admin_project=False):
 
         session = self._engine_facade.get_session()