We can display the time on the Oppo smartphone in either 12-hour or 24-hour format, the latter being selected by default.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Additional settings
Step 3:  Tap on  Date & time
Step 4:  Enable or Disable  24-hour format
  1. Open the Settings
  2. Tap on Additional settings
  3. Tap on Date & time
  4. Enable or Disable 24-hour format

Oppo Instructions
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