How to delete all calendars?

Delete all the schedules in the calendar as follows:

1. Open a calendar application on a mobile device, such as iPhone or Android.

2. Click the "Settings" icon in the upper left corner of the page to enter the settings page.

3. Find the option of "Account Settings" or "Calendar Settings" on the Settings page, and click Enter.

4. Find the item "Clear Calendar" or "Delete Calendar Data", and then select "Delete All" in the next menu.

5. A warning box will pop up, prompting that all calendar data will be permanently deleted. If you confirm that it needs to be deleted, click Yes or OK.

6. Next, you need to wait for a period of time, and the system will delete it according to the amount of data in the calendar. After deletion, a prompt "Delete Successfully" will appear. If the deletion operation is time-consuming, you need to wait patiently.