How to restore the mobile phone calendar after deletion?

Calendar recovery method is as follows:

1. Restore through iCloud official website: Open iCloud official website, log in to your appleid account, and find and restore calendars and reminders in the backup.

2. Restore through mobile phone application management: open the mobile phone settings interface, click on applications and services, then click on application management, select calendar, enter the application information interface, select storage, click on delete data in the storage interface, and finally find the "Restore default settings" option in the settings menu and click.