Invalid date in NSDateFormatter

invalidDate.swift

let formatter = NSDateFormatter()
formatter.dateFormat = "y-M-d"
formatter.timeZone = NSTimeZone(name: "America/Sao_Paulo")

let components = NSDateComponents()
components.day = 19
components.month = 10
components.year = 2015

let date = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!.dateFromComponents(components)
let string = formatter.stringFromDate(date!)

do {
    var result: AnyObject?
    try formatter.getObjectValue(&result, forString: string, range: nil)
    print(result)
} catch let error as NSError {
    print(error)
}