CODEWITHSUNDEEP
iosdatensdatefoundation
Linux world
Linux world

Reputation: 3768

How to calculate the age based on NSDate

how to calculate the age based on the birth date in this format 6/24/1976 mon/date/year...

Upvotes: 54

Views: 33042

Answers (11)

cobbal
cobbal

Reputation: 70763

Many of these answers don't properly account for leap years and such, best is to use Apple's methods instead of dividing by constants.

Swift

let birthday: NSDate = ...
let now = Date()
let ageComponents = calendar.dateComponents([.year], from: birthday, to: now)
let age = ageComponents.year

Objective-C

NSDate* birthday = ...;

NSDate* now = [NSDate date];
NSDateComponents* ageComponents = [[NSCalendar currentCalendar] 
                                   components:NSCalendarUnitYear 
                                   fromDate:birthday
                                   toDate:now
                                   options:0];
NSInteger age = [ageComponents year];

I think this is cleaner and more accurate than any of the other answers here.

Edit

Increase accuracy by setting both birthday and now to noon. Here is one way to do that with a Date extension (in Swift)...

/// Returns a new date identical to the receiver except set to precisely noon.
/// Example: let now = Date().atNoon()
func atNoon() -> Date {
    var components = (Calendar.current as NSCalendar).components([.day, .month, .year, .era, .calendar, .timeZone], from: self)
    components.hour = 12
    components.minute = 0
    components.second = 0
    components.nanosecond = 0
    return Calendar.current.date(from: components)!
}

Upvotes: 264

Maverick
Maverick

Reputation: 3259

Method in Swift 3+ syntax based on cobbal's solution.

func calculateAgeInYearsFromDateOfBirth (birthday: Date) -> Int {
        let now = Date()
        let calendar = Calendar.current

        let ageComponents = calendar.dateComponents([.year], from: birthday, to: now)
        let age = ageComponents.year!
        return age
    }

Upvotes: 2

Dilip Rajkumar
Dilip Rajkumar

Reputation: 7074

This is the code I got from this link.. it works great.. Out put will be like "5 years 6 months" and all usecases are covered in it.

- (NSString *)age:(NSDate *)dateOfBirth {
   NSInteger years;
   NSInteger months;
   NSInteger days;

   NSCalendar *calendar = [NSCalendar currentCalendar];
    unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;

   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]))) {
   years = [dateComponentsNow year] - [dateComponentsBirth year] - 1;
} else {
   years = [dateComponentsNow year] - [dateComponentsBirth year];
}

if ([dateComponentsNow year] == [dateComponentsBirth year]) {
   months = [dateComponentsNow month] - [dateComponentsBirth month];
} else if ([dateComponentsNow year] > [dateComponentsBirth year] && [dateComponentsNow month] > [dateComponentsBirth month]) {
   months = [dateComponentsNow month] - [dateComponentsBirth month];
} else if ([dateComponentsNow year] > [dateComponentsBirth year] && [dateComponentsNow month] < [dateComponentsBirth month]) {
   months = [dateComponentsNow month] - [dateComponentsBirth month] + 12;
} else {
   months = [dateComponentsNow month] - [dateComponentsBirth month];
}

if ([dateComponentsNow year] == [dateComponentsBirth year] && [dateComponentsNow month] == [dateComponentsBirth month]) {
   days = [dateComponentsNow day] - [dateComponentsBirth day];
}

if (years == 0 && months == 0) {
   if (days == 1) {
      return [NSString stringWithFormat:@"%d day", days];
   } else {
      return [NSString stringWithFormat:@"%d days", days];
   }
} else if (years == 0) {
   if (months == 1) {
      return [NSString stringWithFormat:@"%d month", months];
   } else {
      return [NSString stringWithFormat:@"%d months", months];
   }
} else if ((years != 0) && (months == 0)) {
   if (years == 1) {
       return [NSString stringWithFormat:@"%d year", years];
   } else {
       return [NSString stringWithFormat:@"%d years", years];
   }
} else {
  if ((years == 1) && (months == 1)) {
      return [NSString stringWithFormat:@"%d year and %d month", years, months];
  } else if (years == 1) {
      return [NSString stringWithFormat:@"%d year and %d months", years, months];
  } else if (months == 1) {
      return [NSString stringWithFormat:@"%d years and %d month", years, months];
  } else {
      return [NSString stringWithFormat:@"%d years and %d months", years, months];
  }
}
}

If you want age as int try the following answer.. which I got from following link

- (NSInteger)age:(NSDate *)dateOfBirth {
  NSCalendar *calendar = [NSCalendar currentCalendar];
  unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
  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];
  }
}

Hope this helps some one..

Upvotes: 6

raw3d
raw3d

Reputation: 3515

let birthday = NSCalendar.currentCalendar().dateWithEra(1, year: 2016, month: 07, day: 25, hour: 8, minute: 53, second: 0, nanosecond: 0)!

func calculateAge(birthday: NSDate) -> String {

func grammaticalString(forUnit unit: String, value: Int) -> String {
    if value > 1 {
        return "\(value) \(unit)s"
    } else {
        return "\(value) \(unit)"
    }
}

let calendar = NSCalendar.currentCalendar()
let unitFlags: NSCalendarUnit = [NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day, NSCalendarUnit.Hour, NSCalendarUnit.Minute]

let ageComponent = calendar.components(unitFlags, fromDate: birthday, toDate: NSDate(), options: [])
let years = ageComponent.year
let months = ageComponent.month
let days = ageComponent.day
let hours = ageComponent.hour

switch (years, months, days, hours) {
    case (let y, let m, _, _) where y > 0:
        return "\(grammaticalString(forUnit: "Year", value: y)) \(grammaticalString(forUnit: "Month", value: m))"

    case (let y, let m, let d, _) where y == 0 && m > 0:
        return "\(grammaticalString(forUnit: "Month", value: m)) \(grammaticalString(forUnit: "Day", value: d))"

    case (let y, let m, let d, _) where y == 0 && m == 0 && d > 0:
        return "\(grammaticalString(forUnit: "Day", value: d))"

    case (let y, let m, let d, let h) where y == 0 && m == 0 && d == 0 && h > 0:
        return "\(grammaticalString(forUnit: "Hour", value: h))"

    case (let y, let m, let d, let h) where y == 0 && m == 0 && d == 0 && h == 0:

        if ageComponent.minute > 0 {
            return "\(grammaticalString(forUnit: "Minute", value: ageComponent.minute))"
        } else {
            return "-"
        }

    default:
        return "-"
}

}

// Output will be any of these
// 2 Years 3 Months
// 3 Months 0 Days
// 2 Days
// 3 Hours
// 45 Minutes
// -

Upvotes: 0

devok
devok

Reputation: 382

Here's a function to calculate age (Swift 2.1)

func calculateAge (birthday: NSDate) -> NSInteger {

    let calendar : NSCalendar = NSCalendar.currentCalendar()
    let unitFlags : NSCalendarUnit = [NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day]
    let dateComponentNow : NSDateComponents = calendar.components(unitFlags, fromDate: NSDate())
    let dateComponentBirth : NSDateComponents = calendar.components(unitFlags, fromDate: birthday)

    if ( (dateComponentNow.month < dateComponentBirth.month) ||
        ((dateComponentNow.month == dateComponentBirth.month) && (dateComponentNow.day < dateComponentBirth.day))
        )
    {
        return dateComponentNow.year - dateComponentBirth.year - 1
    }
    else {
        return dateComponentNow.year - dateComponentBirth.year
    }
}

Upvotes: 0

Antzi
Antzi

Reputation: 13444

A simple to use swift extension to get the age/how old is a NSDate

extension NSDate {
    var age: Int {
        let calendar: NSCalendar = NSCalendar.currentCalendar()
        let now = calendar.startOfDayForDate(NSDate())
        let birthdate = calendar.startOfDayForDate(self)
        let components = calendar.components(.Year, fromDate: birthdate, toDate: now, options: [])
        return components.year
    }
}

Exemple:

NSDate(timeIntervalSince1970:0).age // => 45 (as of nov 2015) Epoch happened 45 year ago !

By the way, you should be careful, this is the western conception of age, the counting is different in some other countries (Korea for exemple).

Upvotes: 3

Pedro
Pedro

Reputation: 104

May be I'm wrong, but this is simpler, isn't it?

NSTimeInterval ageInterval = [birthDate timeIntervalSinceDate:[NSDate date]];

NSInteger age = ABS(ageInterval / (60 * 60 * 24 * 365));

Upvotes: 2

ravinder521986
ravinder521986

Reputation: 722

   -(NSInteger) ComputeYearMonth
    {
  NSDateFormatter *format = [[NSDateFormatter alloc] init];
[format setDateFormat:@"yyyy-MM-dd"];

NSDate *DateOfBirth=[format dateFromString:[NSString stringWithFormat:@"%@-%@-%@",year,month,day]];
NSDate *currentTime = [NSDate date];

NSLog(@"DateOfBirth======%@",DateOfBirth);

NSInteger years = [[[NSCalendar currentCalendar] components:NSYearCalendarUnit
                                                   fromDate:DateOfBirth
                                                     toDate:currentTime options:0]year];

NSInteger months = [[[NSCalendar currentCalendar] components:NSMonthCalendarUnit
                                                    fromDate:DateOfBirth
                                                      toDate:currentTime options:0]month];
NSLog(@"Number of years: %d",years);
NSLog(@"Number of Months: %d,",months);



    return years;
  // End of Method
  }

Upvotes: 0

holex
holex

Reputation: 24031

the easiest way is to use the NSCalendar:

NSDate *_dateOfBirth = ...;
NSDateComponent *_diff = [[NSCalendar currentCalendar] components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:_dateOfBirth toDate:[NSDate date] options:0];

NSLog(@"%@", _diff);

Upvotes: 0

Vasu Ashok
Vasu Ashok

Reputation: 1413

If u want to find age alone .use below one which include leap year calculation too

- (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];
    }
}

Upvotes: 3

Fabio Poloni
Fabio Poloni

Reputation: 8371

Here's how you can calculate your actual age based on your birth date in years and days:

NSString *birthDate = @"03/31/1990";    
NSDate *todayDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"MM/dd/yyyy"];
int time = [todayDate timeIntervalSinceDate:[dateFormatter dateFromString:birthDate]];
int allDays = (((time/60)/60)/24);
int days = allDays%365;
int years = (allDays-days)/365;

NSLog(@"You live since %i years and %i days",years,days);

It returns the years and the exact days. And if you need you can change the NSDateFormatter and much more.

Upvotes: 9

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