How to set calendar personalization for OPPO Reno2 mobile phone?

OPPO Reno2 setting calendar personalization method:

Open Calendar and click the Settings icon in the upper right corner to personalize your calendar.

Start day of the week: choose one day from Monday to Sunday as the start day.

Show legal holidays: select whether to show legal holidays.

Display Contact Birthdays: Select whether to display contact birthdays.

Display China Gregorian calendar: Select whether to display China Gregorian calendar.

Personalized reminder time: Click "Default Reminder Time" to set the whole day schedule, birthday/anniversary/countdown day schedule and reminder time.

Set time zone: After the time zone priority option is turned on, you can set your own time zone.