1. Open the Apple phone and click the "Settings" icon on the phone screen. 2. Click the General button again. 3. Select the Language and Region option. 4. Click "Calendar". You can see that the calendar is based on the Gregorian calendar. 6. Click "Japanese Calendar" again.

A calendar is a daily publication that records dates and other related information. Each page displays one day's information as a calendar, one month's information as a monthly calendar, and one year's information as an annual calendar. There are many forms, such as calendars, desk calendars, calendar cards and now electronic calendars. The first calendar in China was about 4000 years ago.