Update app.py with current date & not showing on UI

app.py

@@ -35,6 +35,7 @@ if "messages" not in st.session_state:
     st.session_state.messages = [{"role": "system", "content": f"現在的日期: {current_date}"}]
 
 for message in st.session_state.messages:
+    if message['role'] == "system": continue
     with st.chat_message(message["role"]):
         st.markdown(message["content"])