Update app.py

app.py

@@ -242,7 +242,8 @@ def run(self):
     except KeyboardInterrupt:
         print("\nApplication stopped by user.")
 
-
-if __name__ == "__main__":
-    app = App()
-    app.run()
+def main():
+    root = tk.Tk()
+    app = App(root)
+    print(f"===== Application Startup at {datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')} =====")
+    app.run()