Update app.py

app.py

@@ -175,7 +175,7 @@ def save_dpo_data(
     # preparing the submission
     data = {"contributor": contributor_username}
 
-    data["timestamp"] = str(datetime.datetime.now(datetime.UTC))
+    data["timestamp"] = str(datetime.now(timezone.utc))
     data["chat_format"] = dpo_chat_format
     data["prompt"] = history
     data["chosen"] = chosen_chat