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By default, Samsung's One UI user interface displays the time in 24-hour format, which can also be changed to 12-hour format.

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: Enable or disable  Use 24-hour format
  1. Tap on Settings
  2. Tap on General management
  3. Tap on Date and time
  4. Enable or disable Use 24-hour format
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Samsung Instructions