The OnePlus smartphone automatically gets the time zone from the network.

If the time zone or region is to be changed afterwards, the automatic function must first be deactivated.
After selecting the desired region, the corresponding time zone is then set.

Android 10 | OxygenOS 10.0
Time zone & region -  Open the  Settings
Time zone & region -  Tap on  System
Time zone & region -  Tap on  Date & time
Time zone & region -  Disable  Use network-provided time zone
Time zone & region -  Tap on  Time zone
Time zone & region -  Tap on  Region (country/region)
Time zone & region -  Select a  country  or enter a  name
Time zone & region -  Chosse a  suggestion
Time zone & region -  Choose a  time zone
  1. Open the Settings
  2. Tap on System
  3. Tap on Date & time
  4. Disable Use network-provided time zone
  5. Tap on Time zone
  6. Tap on Region (country/region)
  7. Select a country or enter a name
  8. Chosse a suggestion
  9. Choose a time zone

OnePlus Instructions
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