Change calendar display format
How do I change from military time format to standard time in the calendar app
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If you are asking about the "calendar app," on iOS, your only option is to go to Settings>General>Date & Time, and turn-off 24-Hour Time.
If you are asking about macOS Calendar, choose System Preferences...>Language & Region>Time format:, and uncheck 24-Hour Time.
In either case, that selection establishes the system wide preference, not just the calendar display.