iOS：dateformatter快速返回nil

Question

I have this code in my app

service.requestLastDate{ (response) -> () in

        var str = response as NSString

            var d = str.stringByReplacingOccurrencesOfString("\"", withString: "")

            println("D \(str)") // D 2015-05-25 08:13:33

            var dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"

            var date_formatted = dateFormatter.dateFromString(d)

            println("DATE FORMATTED \(date_formatted)") // is NIL

with this code date_formatted is ever nil. If I print in consolle "d" the result is "2015-02-12 08:15:16", this string is a real string. If I try to use the string "example" I get a correct date_formatted. What happen? I can't understand. I just tried changing NSLocale and the timezone for the dateFormatter but I have ever the same result.

this is the request

func requestLastDate(completion:(response:NSString)->()){

        my_req_date = request(.GET, "http://example.com/current_date")
            .responseString { (_, _, string, error) in

            println(" server \(string!)") //server "2015-05-25 08:13:33"
            completion(response: string!)

        }
    }

Answer 1

Hate to break it :)

Think it might be:

"yyyy-MM-dd HH:mm:ss"

not

"yyyy-MM-dd HH:mm"

?

Answer 2

Check your respsonse for that it translates to a proper date-formatted string. Because if I try this, it works:

var response:AnyObject?
response = "2015-03-17 23:34:12"

if let date:AnyObject = response {

    var d = date as! String
    var example = "2015-03-17 23:34:12"

    var dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

    var date_formatted = dateFormatter.dateFromString(d)
}