On hour is subtracted when converting a String to NSDate

Question

This is the code:

let dateString = "2015-07-13T17:32:32.781Z"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "YYYY-MM-dd'T'HH:mm:ss.SSS'Z'"
var theDate = dateFormatter.dateFromString(dateString)!
println(theDate)  // 2015-07-13 16:32:32 +0000

One hour is subtracted to the original date during the process. Why?

Answer 1

@mipadi has explained really well the problem, so I think that you should just set the time zone to UTC.

    let dateString = "2015-07-13T17:32:32.781Z"
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "YYYY-MM-dd'T'HH:mm:ss.SSS'Z'"
    dateFormatter.timeZone = NSTimeZone(abbreviation: "UTC")
    var theDate = dateFormatter.dateFromString(dateString)!
    println(theDate)