Why doesn't Apple's mobile phone have a lunar date?

The calendar of Apple mobile phone is set to display Gregorian calendar date by default, and it needs to be set to display lunar calendar date.

Steps to set lunar calendar date on Apple mobile phone: Settings-Calendar-Other calendars-Lunar calendar.

The specific operation steps are as follows:

First, find the "Settings" icon on the phone desktop and click it, as shown in the figure below.

Then click "Calendar" as shown in the figure below.

Then click "Other calendars" as shown in the figure below.

Then select "Lunar Calendar" as shown in the figure below.

Finally, click on the calendar on the desktop, and you can see today's lunar date.