Hamish Rickerby

Mac and iPhone/iPad developer based in Melbourne, Australia

Calculate Age in Objective-c

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For an iPhone application I’m developing for a client I need to capture the birthdate of a user, and then show their age on a profile screen. I went looking for a function to help with this simple and tedious task, but couldn’t find any example code that could be lifted to help me, so I rolled my own.  Here is what I made, steal as you see fit.

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- (NSInteger)age:(NSDate *)dateOfBirth {
  NSCalendar *calendar = [NSCalendar currentCalendar];
  unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
  NSDateComponents *dateComponentsNow = [calendar components:unitFlags fromDate:[NSDate date]];
  NSDateComponents *dateComponentsBirth = [calendar components:unitFlags fromDate:dateOfBirth];

  if (([dateComponentsNow month] < [dateComponentsBirth month]) ||
      (([dateComponentsNow month] == [dateComponentsBirth month]) && ([dateComponentsNow day] < [dateComponentsBirth day]))) {
    return [dateComponentsNow year] - [dateComponentsBirth year] - 1;
  } else {
    return [dateComponentsNow year] - [dateComponentsBirth year];
  }
}

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