Decoding NSDate using Himotoki before 2.0 (-beta)

NSDate+Decodable.swift

import Foundation
import Himotoki

enum ISO8601DateError: ErrorType {
  case WrongFormat(string: String)
}

private let iso8601DateFormatter = NSDate.createIso8601DateFormatter()

extension NSDate: Decodable {
  public static func decode(e: Extractor) throws -> NSDate {
    if let string = e.rawValue as? String {
      return try NSDate.dateFromIso8601String(string)
    } else {
      throw DecodeError.TypeMismatch(expected: "String", actual: e.description, keyPath: "date")
    }
  }
  
  private static func createIso8601DateFormatter() -> NSDateFormatter {
    let formatter = NSDateFormatter()
    formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZ"
    return formatter
  }
  
  private static func dateFromIso8601String(iso8601String: String) throws -> NSDate {
    if let date = iso8601DateFormatter.dateFromString(iso8601String) {
      return date
    }
    throw ISO8601DateError.WrongFormat(string: iso8601String)
  }
}