How are you, my friend? How do I set a car clock? Can you explain to me?
Depends on your version of operation system. I don't know if you have HongMeng version 2.0.1 or newer. For all previous ones you need to access engineering menu and it will be almost same layout of settings as on Android phone.
❗but by pressing wrong buttons you can completely disable your car❗.
If you really want to proceed, let me know and I will try to give you step by step guidance