Update app.py

app.py

@@ -111,8 +111,8 @@ def calculate_late_interest(data, late_interest_rate, boe_rates_df):
 # Function to analyze Excel sheet and extract relevant information
 def analyze_excel(df):
     # Extract due dates and payment dates
-    due_dates = df.iloc[:, 0].dropna().tolist()
-    payment_dates = df.iloc[:, 1].dropna().tolist()
+    due_dates = pd.to_datetime(df.iloc[:, 0], errors='coerce').dropna()  # Convert to datetime and drop NaT values
+    payment_dates = pd.to_datetime(df.iloc[:, 1], errors='coerce').dropna()  # Convert to datetime and drop NaT values
     amounts = []
 
     # Extract and clean amounts from third column