Parsing a ISO8601 String to Date in Swift

Question

I am getting the next string from an API which claims

All date formats are ISO8601.

I am trying with the next code:

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
let updatedAtStr = "2016-06-05T16:56:57.019+01:00"
let updatedAt = dateFormatter.date(from: updatedAtStr)

Unfortunately resulting updatedAt is nil

Answer 1

Your date format is incorrect, you need to take into account the milliseconds.

let dateFormatter = DateFormatter()

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

let updatedAtStr = "2016-06-05T16:56:57.019+01:00"
let updatedAt = dateFormatter.date(from: updatedAtStr) // "Jun 5, 2016, 4:56 PM"

Just to clarify, the addition of .SSS in the date format is what fixes the problem.