Apple's mobile phone calendar doesn't show volts.

1. Open the calendar on your mobile phone, see that there is no yellow calendar here, and then find the setting function.

2. Click Settings to enter the settings list interface.

3. Slide the window to find the calendar function.

4. Click on the calendar to enter the calendar window.

5. Click the "Open" button to display the China Gregorian calendar, and the setting is complete.

6. Opening the calendar interface again will display a yellow calendar.