为什么我的日期解析器在Swift中不起作用？

Question

I have a json that contains date field:

"created_at":"2016-03-06T16:39:29.786Z"

in my app I'm doing like this:

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-ddThh:mm:ss.SSSZ"
let created_at = json["created_at"].string
let crd = dateFormatter.dateFromString(created_at!)
print(crd) //prints nil

Why am I getting nil there?

Answer 1

You need to quote literal text and you are using the wrong format specifier for the hour.

The T must be quoted.

hh is for 12-hour format but you have 24-hour format which is HH .

So you want:

dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"