How to set the year, month and day on the screen of Apple's mobile phone?

1. first, enter the settings of iOS 10-calendar settings, as shown in the figure below.

2. Continue to enter the "Other Calendars" setting, and then select "Lunar Calendar" which is displayed as "Off" by default. After completion, check the screen lock interface and see if the lunar calendar is hidden, as shown in the figure below.

Later, if you need to show the lunar calendar again, just go to Settings-> Date-> For other calendars, just choose "Lunar Calendar".