Swift: Convert ISO8601 to Unix Epoch

Question

I'd like to take a ISO8601 timestamp, like this: YYYY-MM-DDTHH:MM:SSZ, and convert it to a Unix epoch time stamp using Swift.

Answer 1

ISO8601DateFormatter converts the string to Date, timeIntervalSince1970 gets the UNIX timestamp.

let timestamp = ISO8601DateFormatter().date(from: "2017-07-14T20:00:00Z")!.timeIntervalSince1970

Answer 2

After searching all the stackoverflow, I could create a working snippet!!

let isoFormatter = ISO8601DateFormatter()
    isoFormatter.formatOptions = [.withFullDate,.withTime, .withFractionalSeconds,.withDashSeparatorInDate,.withColonSeparatorInTime]
    let date = UInt64((isoFormatter.date(from: "2021-04-14T10:09:10.773Z")?.timeIntervalSince1970 ?? 0) * 1000) // your time here with milliseconds
print(date) // prints 1619706315298

Answer 3

• Swift 4 / swift 5

---

here is an extension

extension String{
func dateToEpoch() -> UInt64 {
    let isoFormatter = ISO8601DateFormatter()
isoFormatter.formatOptions = [.withFullDate,.withTime, .withFractionalSeconds,.withDashSeparatorInDate,.withColonSeparatorInTime]
let date = UInt64((isoFormatter.date(from: self)?.timeIntervalSince1970 ?? 0) * 1000)
    return date
}                                                               
}

usage

let epochTime =  "2021-04-14T10:09:10.773Z".dateToEpoch()
print(epochTime)