Update app.py

app.py

@@ -18,7 +18,7 @@ st.write('---')
 # Sidebar
 st.sidebar.subheader('Query parameters')
 start_date = st.sidebar.date_input("Start date", datetime.date(2019, 1, 1))
-end_date = start_date + dt.timedelta(days=7)
+end_date = start_date + datetime.timedelta(days=7)
 
 # User input for the stock ticker symbol
 tickerSymbol = st.sidebar.text_input('Enter Stock Ticker Symbol')