NSDateComponentsFormatter Weirdness

NSDateComponentsFormatterWeirdness.playground

//: Playground - noun: a place where people can play

import Foundation

let formatter = NSDateComponentsFormatter()
formatter.unitsStyle = .Abbreviated
formatter.maximumUnitCount = 1
formatter.allowsFractionalUnits = true
var allowedUnits: NSCalendarUnit = [
    .Year,
    .Month,
    .WeekOfMonth,
    .Day,
    .Hour,
    .Minute,
    .Second
]
formatter.allowedUnits = allowedUnits

let referenceDate = NSDate(timeIntervalSince1970: 1449608914.85899)
let targetDate = NSDate(timeIntervalSince1970: 1449433057.776354)

let distance = abs(targetDate.timeIntervalSinceDate(referenceDate))
let string: String

if distance <= 60 {
    string = "now"
} else {
    string = formatter.stringFromDate(targetDate, toDate: referenceDate) ?? "<NO_RESULT>"
}

// string returns "2d 1h"