https://res.cloudinary.com/practicaldev/image/fetch/s--RviEUObi--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://www.syncfusion.com/blogs/wp-content/uploads/2021/11/Restricting-Users-to-Reschedule-Appointments-in-the-Past-Dates-in-Flutter-Event-Calendar.png