Swift ~ format NSDate to String

format_date.swift

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

import Foundation
import Cocoa

extension NSDate {
    func toS(let format:String) -> String? {
        let formatter:NSDateFormatter = NSDateFormatter()
        formatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
        formatter.timeZone = NSTimeZone()
        formatter.dateFormat = format
        return formatter.stringFromDate(self)
    }
}

var today = NSDate().toS("dd MMMM YYYY")

returns "25 July 2016"