Use of external RTC chip

Hello everyone!
I have a MatekH743. There is no GPS, but I need a time reference. I want to use a RV3028 or DS3231 real time clock chip connected to I2C2.
How do I do this? What is the sequence of steps to connect this chip? Or is it impossible?
Thank you.

Unfortunately, most flight controllers do not include the battery and external oscillator needed for the uController’s internal RTC to keep time.
Easiest way to set the time is to connect to your vehicle a GCS before flight, that will set the time onboard.
If you want to use an external RTC chip, you have to write a driver for it, which is not easy if you are not a seasoned C++ programmer.

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