How does Apple's mobile phone update the calendar holiday?

2. Click the AppleID at the top to display the user's name and avatar.

3. click iCloud.

4. On the iCloud page, slide down to the calendar and make sure the switch next to it is turned on.

Please wait a moment for the system to synchronize the calendar data.

6. If you need to subscribe to holiday calendars in other regions, you can select an account in the calendar application, select Add Account, and then select Other in the pop-up window.

7. In the new page, select Subscription and select the calendar to subscribe to.