iOS Checking device is in 24 hour format or not

We need to check the device time format and display time stuff accordingly in the app.

12-hour format

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24-hour format 

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Objective C

  + (BOOL)isDeviceIn24HoursFormat {

     NSString *dateFormat = [NSDateFormatter 

           dateFormatFromTemplate:@"j" options:0 locale:     

                              [NSLocale currentLocale]];

     if ([dateFormat rangeOfString:@"a"].location == 

                                                           NSNotFound) {

        return YES;

     }

     return NO;

  }

Swift

  func isDeviceIn24HoursFormat() -> Bool {

        let dateFormat: String? = 

                    DateFormatter.dateFormat(fromTemplate: 

                       "j", options: 0, locale: NSLocale.current) 

        if ((dateFormat as NSString?)?.range(of: "a"))?.location 

                                                            == NSNotFound

        {

            return true

        }

        return false

    }

 }

12-hour format    dateFormat  =  "h a"

24-hour format    dateFormat  =  "HH"

Hope this post is useful. Feel free to comment incase of any queries.