Fix form submission issues and add Excel download functionality

create_excel.py

@@ -101,6 +101,14 @@ def calculate_years(starting_date, duration):
             day, month, year = map(int, starting_date.split('/'))
         elif '.' in starting_date:
             day, month, year = map(int, starting_date.split('.'))
+        elif '-' in starting_date:
+            # Handle ISO format (yyyy-mm-dd)
+            date_parts = starting_date.split('-')
+            if len(date_parts) == 3:
+                year, month, day = map(int, date_parts)
+            else:
+                # Default to current date if format is not recognized
+                return default_years
         else:
             # If format is not recognized, return default
             return default_years