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

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Additional settings
Step 3: Tap on  Date & time
Step 4: Enable or disable  24-hour format
  1. Tap on Settings
  2. Tap on Additional settings
  3. Tap on Date & time
  4. Enable or disable 24-hour format
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Oppo Instructions