为什么这个 NSDateFormatter return 为零？

Question

为什么下面return nil?

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM/dd"
let formattedDate = dateFormatter.dateFromString("2016-04-20 06:00:00 +0000")

Answer 1

可以获得Date：04/20

    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss ZZZZZ"
    let Date = dateFormatter.dateFromString("2016-04-20 06:00:00 +0000")

    dateFormatter.dateFormat = "MM/dd"
    let newDate  = dateFormatter.stringFromDate(Date!)

    print(newDate)