streamlit_app.py

```python
import streamlit as st
import requests

st.title("Current Timing Fast API")

response = requests.get("http://worldclockapi.com/api/json/utc/now")

if response.status_code == 200:
    current_time = response.json()["currentDateTime"]
    st.write(f"The current timing is: {current_time}")
else:
    st.write("Error: Unable to retrieve current timing")
```