Swift ISO8601 format to Date

If you have a date such as:

let isoDate = "2018-12-26T13:48:05.000Z"

and you want to parse it into a Date, use:

let isoDateFormatter = ISO8601DateFormatter()
isoDateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
isoDateFormatter.formatOptions = [
    .withFullDate,
    .withFullTime,
    .withDashSeparatorInDate,
    .withFractionalSeconds]

if let realDate = isoDateFormatter.date(from: isoDate) {
    print("Got it: \(realDate)")
}

The important thing is to provide all the options for each part of the data you have. In my case, the seconds are expressed as a fraction.

You can specify ISO8601 date formate to the NSDateFormatter to get Date:

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyyMMdd'T'HHmmssZ"
print(dateFormatter.date(from: dateString)) //2018-02-07 12:46:00 +0000

You need to specify the format options for the ISO8601DateFormatter to match your requirements (year, month, day and time), here is an example below:

//: Playground - noun: a place where people can play

import UIKit

let dateString = "20180207T124600Z"
let dateFormatter = ISO8601DateFormatter()

dateFormatter.formatOptions = [
    .withYear,
    .withMonth,
    .withDay,
    .withTime
]

print(dateFormatter.string(from: Date()))
print(dateFormatter.date(from: dateString))