Easter calculation in Swift

Easter.swift

// Easter calculation in swift after Anonymous Gregorian algorithm
// Also known as Meeus/Jones/Butcher algorithm

import Foundation

func easter(Y : Int) -> NSDate {
  let a = Y % 19
  let b = Int(floor(Double(Y) / 100))
  let c = Y % 100
  let d = Int(floor(Double(b) / 4))
  let e = b % 4
  let f = Int(floor(Double(b+8) / 25))
  let g = Int(floor(Double(b-f+1) / 3))
  let h = (19*a + b - d - g + 15) % 30
  let i = Int(floor(Double(c) / 4))
  let k = c % 4
  let L = (32 + 2*e + 2*i - h - k) % 7
  let m = Int(floor(Double(a + 11*h + 22*L) / 451))
  let components = NSDateComponents()
  components.year = Y
  components.month = Int(floor(Double(h + L - 7*m + 114) / 31))
  components.day = ((h + L - 7*m + 114) % 31) + 1
  components.timeZone = NSTimeZone(forSecondsFromGMT: 0)
  let cal = NSCalendar(calendarIdentifier: NSGregorianCalendar)
  return cal.dateFromComponents(components)
}

println(easter(2014))  // "2014-04-20 00:00:00 +0000"

Thanks so much for this!