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)
Step 1:  Open the  Settings
Step 2:  Tap on  System & updates
Step 3:  Tap on  Date & time
Step 4:  Disable  Set automatically
Step 5:  Tap on  Time
Step 6:  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