Update app.py

app.py

@@ -1,7 +1,8 @@
 import streamlit as st
 import pandas as pd
 import numpy as np
-from datetime import datetime, timedelta
+from datetime import datetime
+from dateutil.relativedelta import relativedelta
 
 def main():
     st.title("Кредитный калькулятор")
@@ -30,7 +31,7 @@ def main():
         monthly_payment = monthly_payment_differentiated
     
     start_date = datetime.now()
-    end_date = start_date + timedelta(months=loan_term)
+    end_date = start_date + relativedelta(months=loan_term)
 
     # Сохранение результатов
     save_to_file(income, loan_payments, has_guarantors, loan_term, interest_rate, preferential_rate,