Calculate Age from Birth Date Using Nsdatecomponents in Swift

Calculate age from birth date using NSDateComponents in Swift

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!

Calculate age from birth date

update: Xcode 11 • Swift 5.1

You can use the Calendar method dateComponents to calculate how many years from a specific date to today:

extension Date {
    var age: Int { Calendar.current.dateComponents([.year], from: self, to: Date()).year! }
}

---

let dob = DateComponents(calendar: .current, year: 2000, month: 6, day: 30).date!
let age = dob.age // 19

Convert facebook birthday to age swift

 func yearsBetween(date1: Date, date2: Date) -> Int {
        let calendar = Calendar.current
        let components = calendar.dateComponents([Calendar.Component.year], from: date1, to: date2)
        return components.year ?? 0
    }

// Get Age

    let dateString = "01/12/1990"
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd/MM/yyyy"
    let date1 = dateFormatter.date(from: dateString)
    let date2 = Date()
    let age  = self.daysBetween(date1:date1!, date2:date2)

Hope it will help you.

Get age from range in SwiftUI DatePicker

You can use .onChange to track the changes in birthDate and do the calculation inside the closure.

Note: SwiftUI runs this closure in main thread. so If you want to do expensive work there you should dispatch to a background Queue to let the UI run smoothly.

struct ContentView: View {
    
    @State private var birthDate = Date()
    @State private var age: DateComponents = DateComponents()
    
    var body: some View{
        VStack {
            Form {
                DatePicker("Birth date:", selection: $birthDate, in: ...Date(), displayedComponents: .date).datePickerStyle(WheelDatePickerStyle()).font(.title)
            }.onChange(of: birthDate, perform: { value in
                age = Calendar.current.dateComponents([.year, .month, .day], from: birthDate, to: Date())
        })
            Text("Age-> Years:\(age.year ?? 0) Months:\(age.month ?? 0) Days\(age.day ?? 0)")
        }
    }
}

How do I get the age after using a date picker?

This will work fine for u

var birthday: NSDate = .....  //date that comes from date picker
var now: NSDate = NSDate()
var ageComponents: NSDateComponents = NSCalendar.currentCalendar().components(.Year, fromDate: birthday, toDate: now, options: 0)
var age: Int = ageComponents.year()

If u want to formate date you can use DateFormatter

Ex.

let usDateFormat = NSDateFormatter.dateFormatFromTemplate("MMddyyyy", options: 0, locale: NSLocale(localeIdentifier: "en-US"))
//usDateFormat now contains an optional string "MM/dd/yyyy".

let gbDateFormat = NSDateFormatter.dateFormatFromTemplate("MMddyyyy", options: 0, locale: NSLocale(localeIdentifier: "en-GB"))
//gbDateFormat now contains an optional string "dd/MM/yyyy"

formatter.dateFormat = usDateFormat
let usSwiftDayString = formatter.stringFromDate(swiftDay)
// usSwiftDayString now contains the string "06/02/2014".


formatter.dateFormat = gbDateFormat
let gbSwiftDayString = formatter.stringFromDate(swiftDay)
// gbSwiftDayString now contains the string "02/06/2014".

Calculating Age: Ambiguous reference to member on DateComponents

You have a few issues in your code

1. You should use Date, not NSDate in Swift
2. birthdayDate is a String, but the from: parameter needs to be an instance of Date
3. The components parameter needs to be a set.

Correcting these gives you:

@objc func dateChanged(datePicker: UIDatePicker) {

    let birthdayDate = datePicker.date
    let myCalendar = Calendar(identifier: .gregorian)
    let dmy = myCalendar.dateComponents([.day, .month, .year], from: Date())

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd/MM/yyyy"

    inputTextField.text = dateFormatter.string(from: birthdayDate)

    let now = Date()
    let ageComponents = myCalendar.dateComponents([.year], from: birthdayDate, to: now)
    let age = ageComponents.year!

    label.text = "\(age)"

    view.endEditing(true)

}

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