The date is obtained on the Samsung device using the mobile network, but if you want to change the date manually, you must first deactivate the automatic function on the Samsung device.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General management
Step 3:  Tap on  Date and time
Step 4:  Disable  Automatic date and time
Step 5:  Tap on  Set date
Step 6:  Choose desired  date
Step 7:  Confirm with  Done
  1. Open the Settings
  2. Tap on General management
  3. Tap on Date and time
  4. Disable Automatic date and time
  5. Tap on Set date
  6. Choose desired date
  7. Confirm with Done

Samsung Instructions
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