How to calculate age with days/month/year using date picker? [duplicate] - swift

Question

I am trying calculate the age from birthdayDate in Swift with this function:
var calendar : NSCalendar = NSCalendar.currentCalendar()
var dateComponentNow : NSDateComponents = calendar.components(
NSCalendarUnit.CalendarUnitYear,
fromDate: birthday,
toDate: age,
options: 0)
But I get an error Extra argument toDate in call
In objective c this was the code, but I don't know why get this error:
NSDate* birthday = ...;
NSDate* now = [NSDate date];
NSDateComponents* ageComponents = [[NSCalendar currentCalendar]
components:NSYearCalendarUnit
fromDate:birthday
toDate:now
options:0];
NSInteger age = [ageComponents year];
Is there correct form better than this?

Answer 1

You get an error message because 0 is not a valid value for NSCalendarOptions.
For "no options", use NSCalendarOptions(0) or simply nil:
let ageComponents = calendar.components(.CalendarUnitYear,
fromDate: birthday,
toDate: now,
options: nil)
let age = ageComponents.year
(Specifying nil is possible because NSCalendarOptions conforms to the RawOptionSetType protocol which in turn inherits
from NilLiteralConvertible.)
Update for Swift 2:
let ageComponents = calendar.components(.Year,
fromDate: birthday,
toDate: now,
options: [])
Update for Swift 3:
Assuming that the Swift 3 types Date and Calendar are used:
let now = Date()
let birthday: Date = ...
let calendar = Calendar.current
let ageComponents = calendar.dateComponents([.year], from: birthday, to: now)
let age = ageComponents.year!

Answer 2

I create this method its very easy just put the birthday date in the method and this will return the Age as a Int
Swift 3
func calcAge(birthday: String) -> Int {
let dateFormater = DateFormatter()
dateFormater.dateFormat = "MM/dd/yyyy"
let birthdayDate = dateFormater.date(from: birthday)
let calendar: NSCalendar! = NSCalendar(calendarIdentifier: .gregorian)
let now = Date()
let calcAge = calendar.components(.year, from: birthdayDate!, to: now, options: [])
let age = calcAge.year
return age!
}
Swift 2
func calcAge(birthday: String) -> Int{
let dateFormater = NSDateFormatter()
dateFormater.dateFormat = "MM/dd/yyyy"
let birthdayDate = dateFormater.dateFromString(birthday)
let calendar: NSCalendar! = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
let now: NSDate! = NSDate()
let calcAge = calendar.components(.Year, fromDate: birthdayDate!, toDate: now, options: [])
let age = calcAge.year
return age
}
Usage
print(calcAge("06/29/1988"))

Answer 3

For swift 4 works fine
func getAgeFromDOF(date: String) -> (Int,Int,Int) {
let dateFormater = DateFormatter()
dateFormater.dateFormat = "YYYY-MM-dd"
let dateOfBirth = dateFormater.date(from: date)
let calender = Calendar.current
let dateComponent = calender.dateComponents([.year, .month, .day], from:
dateOfBirth!, to: Date())
return (dateComponent.year!, dateComponent.month!, dateComponent.day!)
}
let age = getAgeFromDOF(date: "2000-12-01")
print("\(age.0) Year, \(age.1) Month, \(age.2) Day")

Answer 4

This works for Swift 3
let myDOB = Calendar.current.date(from: DateComponents(year: 1994, month: 9, day: 10))!
let myAge = Calendar.current.dateComponents([.month], from: myDOB, to: Date()).month!
let years = myAge / 12
let months = myAge % 12
print("Age : \(years).\(months)")

Answer 5

This is working in swift 3 for me..
let now = NSDate()
let calendar : NSCalendar = NSCalendar.current as NSCalendar
let ageComponents = calendar.components(.year, from: datePickerView.date, to: now as Date, options: [])
let age = ageComponents.year!
ageCalculated.text = String(age)
Thanks to #Martin R

Answer 6

//Create string extension to make more easy
extension String {
func getDate(format: String) -> Date {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = format
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
return dateFormatter.date(from: self) ?? Date()
}
}
Get today's date and your birthday date
let today = Date()
let birthDate = "1990-01-01".getDate(format: "yyyy-MM-dd")
Create an instance of the user's current calendar
let calendar = Calendar.current
Use calendar to get difference between two dates
let components = calendar.dateComponents([.year, .month, .day], from: birthDate, to: today)
let ageYears = components.year //get how many years old
let ageMonths = components.month //extra months
let ageDays = components.day // extra days

Answer 7

This is the best way on swift 5
lazy var dateFormatter : DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
formatter.locale = Locale(identifier: "en_US_POSIX")
return formatter
}()
let birthday = dateFormatter.date(from: "1980-04-25")
let timeInterval = birthday?.timeIntervalSinceNow
let age = abs(Int(timeInterval! / 31556926.0))