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