This application uses the calendar function of iOS. With this calendar setting, schedules older than one month are automatically saved in iCloud and disappear from the terminal.
In order to display these past events, please change the setting as below.
1. Open the iOS Settings application.
2. Tap "Calendar".
3. Tap "Synchronize".
4. Tap "All Events".
It's all
When you open the calendar application, all the events are displayed.