NSDate Extension not working - ios

Question

This is a piece of code that was working in earlier version of swift. It is now giving an error (Cannot convert value of type 'NSDate' to type 'NSDate.Date' in coercion)
extension NSDate {
struct Date {
static let formatterISO8601: DateFormatter = {
let formatter = DateFormatter()
formatter.calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.ISO8601)! as Calendar
formatter.locale = NSLocale.current
formatter.timeZone = NSTimeZone(forSecondsFromGMT: 0) as TimeZone!
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
return formatter
}()
}
var formattedISO8601: String { return Date.formatterISO8601.string(from: self as Date) }
}

Answer 1

Issue is that in Swift 3 there is already a structure define with named Date.
So what you can do is change your struct name to MyDate or something else and you all set to go.
Also it is better if you use new Date, Calendar and TimeZone instead of NSDate, NSCalendar and NSTimeZone.
Or make extension of Date like this way.
extension Date {
static let formatterISO8601: DateFormatter = {
let formatter = DateFormatter()
formatter.calendar = Calendar(identifier: .iso8601)
formatter.locale = Locale.current
formatter.timeZone = TimeZone(secondsFromGMT: 0)
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
return formatter
}()
var formattedISO8601: String { return Date.formatterISO8601.string(from: self) }
}

Answer 2

Extensions for both NSDate and Date.
extension Date {
static let formatterISO8601: DateFormatter = {
let formatter = DateFormatter()
formatter.calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.ISO8601)! as Calendar
formatter.locale = NSLocale.current
formatter.timeZone = NSTimeZone(forSecondsFromGMT: 0) as TimeZone!
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
return formatter
}()
func formattedISO8601() -> String {
return Date.formatterISO8601.string(from: self)
}
}
extension NSDate {
func formattedISO8601() -> String {
return Date.formatterISO8601.string(from: self as Date)
}
}
And use it like this ...
// NSDate
let nsdate = NSDate.init()
let formattedDate = nsdate.formattedISO8601()
// Date
let date = Date.init()
let formattedNsDate = date.formattedISO8601()

Answer 3

try this
extension Date {
static let formatterISO8601: DateFormatter = {
let formatter = DateFormatter()
formatter.calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.ISO8601)! as Calendar
formatter.locale = NSLocale.current
formatter.timeZone = NSTimeZone(forSecondsFromGMT: 0) as TimeZone!
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
return formatter
}()
var formattedISO8601: String { return Date.formatterISO8601.string(from: self)
}
}