diff --git a/orchestrator/activities/mongo_db.py b/orchestrator/activities/mongo_db.py
index e53f51a..d456d7e 100644
--- a/orchestrator/activities/mongo_db.py
+++ b/orchestrator/activities/mongo_db.py
@@ -10,7 +10,7 @@ with workflow.unsafe.imports_passed_through():
     from sientia_do.notifications.models import NotificationLevel
     from sientia_do.temporal.activities.base import BaseActivity
     from sientia_do.temporal.constants import DATETIME_FORMAT_MS_WITH_TZ, now
-    from datetime import datetime
+    from datetime import datetime, timezone
 
 
 def clear_mongo_id(docs: list) -> list:
@@ -459,7 +459,7 @@ class MongoDB(BaseActivity):
             )
 
             for item in data:
-                item['timestamp'] = item['timestamp'].strftime(
+                item['timestamp'] = item['timestamp'].replace(tzinfo=timezone.utc).strftime(
                     DATETIME_FORMAT_MS_WITH_TZ)
 
             self.info(