Android How to Switch between 12-/24-hour format
Android 3166
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 The time format is used by default based on the language setting. If the time format has to be displayed regardless of the set language, we have to disable the locale default . Then it is possible to manually switch between 12- or 24-hour format (AM/PM).
 Android 14    
 
   
   
   
   - Tap on Settings
 - Tap on System
 - Tap on Date & time
 - Enable or disable Use 24-hour format