How to set dual clock on lock screen or home screen

You can go to

realme UI 1.0 & above versions: Settings > System & updates/Additional/System settings > Date & time > Dual clock > Turn on Dual clock.

realme UI R & Go & S & T & U Edition: not support

And you can set display dual clock on Lock screen, Home screen clock widget, and Lock screen & Home screen clock widget.

Note: The usual residence needs to be set before setting the dual clock.