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

Samsung Instructions
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