diff --git a/backend/main.py b/backend/main.py
index cd933dc..d87b464 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -71,7 +71,7 @@ async def get_current_user(token: str = Depends(oauth2_scheme)) -> User:
 @app.post("/chat/new")
 async def chat_new(current_user: User = Depends(get_current_user)) -> dict:
     chat_id = str(uuid4())
-    timestamp = datetime.now().isoformat()
+    timestamp = datetime.utcnow().isoformat()
     user_id = current_user.email
     with Database() as connection:
         connection.execute(
@@ -177,7 +177,7 @@ async def log_response_to_db(chat_id: str, full_response: str):
     with Database() as connection:
         connection.execute(
             "INSERT INTO message (id, timestamp, chat_id, sender, content) VALUES (?, ?, ?, ?, ?)",
-            (response_id, datetime.now().isoformat(), chat_id, "assistant", full_response),
+            (response_id, datetime.utcnow().isoformat(), chat_id, "assistant", full_response),
         )
 
 async def memorize_response(rag_config: RagConfig, chat_id: str, question: str, answer: str):
diff --git a/frontend/lib/chat.py b/frontend/lib/chat.py
index f4c6141..f07294f 100644
--- a/frontend/lib/chat.py
+++ b/frontend/lib/chat.py
@@ -18,8 +18,7 @@ class Message:
 
     def __post_init__(self):
         self.id = str(uuid4()) if self.id is None else self.id
-        self.timestamp = datetime.now().isoformat() if self.timestamp is None else self.timestamp
-
+        self.timestamp = datetime.utcnow().isoformat() if self.timestamp is None else self.timestamp
 
 def chat():
     prompt = st.chat_input("Say something")
diff --git a/frontend/lib/sidebar.py b/frontend/lib/sidebar.py
index 8490742..40e2a90 100644
--- a/frontend/lib/sidebar.py
+++ b/frontend/lib/sidebar.py
@@ -20,7 +20,7 @@ def sidebar():
             chats_by_time_ago = {}
             for chat in chat_list:
                 chat_id, timestamp = chat["id"], chat["timestamp"]
-                time_ago = humanize.naturaltime(datetime.now() - datetime.fromisoformat(timestamp))
+                time_ago = humanize.naturaltime(datetime.utcnow() - datetime.fromisoformat(timestamp))
                 if time_ago not in chats_by_time_ago:
                     chats_by_time_ago[time_ago] = []
                 chats_by_time_ago[time_ago].append(chat)