How does Apple mobile phone change the Hong Kong calendar to the mainland calendar?

We can change the Hong Kong calendar to the mainland calendar on Apple's mobile phone. We just need to open Apple's mobile calendar and click Subscribe to subscribe to the Chinese mainland calendar.

In addition, you can also use the calendar cloud notes on Apple's mobile phone, so that you can take notes and set reminders leisurely, and you can also view calendars and month views of Gregorian and Lunar calendars.