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You can only change the Time Zone on your Samsung device if the automatic time and date is disabled, and only then can you change the Time Zone.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  General management
Step 3: Tap on  Date and time
Step 4: Turn Off  Automatic date and time
Step 5: Tap on  Select time zone
Step 6: Tap on  Region
Step 7: Set the  Region
Step 8: Set the  Time zone
  1. Tap on Settings
  2. Tap on General management
  3. Tap on Date and time
  4. Turn Off Automatic date and time
  5. Tap on Select time zone
  6. Tap on Region
  7. Set the Region
  8. Set the Time zone
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Samsung Instructions