By default, the current date is automatically obtained from the network, but if we want to change this on the Xiaomi smartphone afterwards, we have to disable the automatic date and time feature.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Date & time
Step 4:  Disable  Use network-provided time
Step 5:  Tap on  Date
Step 6:  Set the  date  and tap  OK
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Date & time
  4. Disable Use network-provided time
  5. Tap on Date
  6. Set the date and tap OK

Xiaomi Instructions