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By default, data usage on the Oppo smartphone is charged from the first day of the month, but you can set the billing cycle date to any other day of the month in the mobile data settings.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM card & mobile data
Step 3: Tap on  Data usage
Step 4: Tap on  Mobile data limit
Step 5: Tap on  Start date for data usage stats
Step 6: Set a  Start date  and tap  Save
  1. Tap on Settings
  2. Tap on SIM card & mobile data
  3. Tap on Data usage
  4. Tap on Mobile data limit
  5. Tap on Start date for data usage stats
  6. Set a Start date and tap Save
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Oppo Instructions