Update app.py

app.py

@@ -110,23 +110,20 @@ def convert_schedule(file_path, direction):
         for col in result_clean.columns:
             result_clean[col] = result_clean[col].astype(str)
 
-        # Create Excel file in memory
+        # Create CSV file in memory (more reliable than Excel)
         download_df = result_clean.reset_index().rename(columns={'index': first_col_name})
         
-        # Use BytesIO to create file in memory
-        excel_buffer = io.BytesIO()
-        
-        with pd.ExcelWriter(excel_buffer, engine='openpyxl') as writer:
-            download_df.to_excel(writer, sheet_name='Converted Schedule', index=False)
-        
-        excel_buffer.seek(0)
+        # Create CSV content
+        csv_buffer = io.StringIO()
+        download_df.to_csv(csv_buffer, index=False)
+        csv_content = csv_buffer.getvalue()
         
         # Create filename with timestamp
         timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
-        filename = f"converted_schedule_{timestamp}.xlsx"
+        filename = f"converted_schedule_{timestamp}.csv"
         
-        # Return the buffer content for download
-        return display_df, (excel_buffer.getvalue(), filename)
+        # Return the CSV content for download
+        return display_df, (csv_content.encode('utf-8'), filename)
 
     except Exception as e:
         error_msg = f"Error processing file: {str(e)}"
@@ -151,8 +148,9 @@ def process_and_download(file_path, direction):
     temp_dir = tempfile.gettempdir()
     temp_path = os.path.join(temp_dir, filename)
     
-    with open(temp_path, 'wb') as f:
-        f.write(excel_content)
+    # Write CSV content
+    with open(temp_path, 'w', encoding='utf-8') as f:
+        f.write(excel_content.decode('utf-8'))
     
     return display_result, temp_path
 
@@ -174,7 +172,7 @@ iface = gr.Interface(
     ],
     outputs=[
         gr.Dataframe(label='Converted Schedule (Preview)', wrap=True),
-        gr.File(label='Download Converted Schedule (.xlsx)')
+        gr.File(label='Download Converted Schedule (.csv)')
     ],
     title='🔄 7-Day Schedule Converter',
     description=(