The time is automatically obtained from the network and set on the Huawei smartphone, if we want to set the time manually, the automatic must be disabled.

Android 10 | EMUI 10.0
Set time -  Open the  Settings
Set time -  Tap on  System & updates
Set time -  Tap on  Date & time
Set time -  Disable  Set automatically
Set time -  Tap on  Time
Set time -  Set the  time  and tap  OK
  1. Open the Settings
  2. Tap on System & updates
  3. Tap on Date & time
  4. Disable Set automatically
  5. Tap on Time
  6. Set the time and tap OK

Huawei Instructions