Swift get server time

Question

Is there a way to get a server time to use with swift. I want to set a static time based on a server. so that even if a user changes the time zone and the date, it wouldn\'t

Answer 1

You shouldn't make the same network call every time you need to get corrected datetime.

So I would do like below, so I can call setSeverDate() only when I need to correct datetime:

var serverDate = Date() {
    didSet {
        let possibleNow = Date()
        gap = possibleNow.distance(to: serverDate)
    }
}
var gap: TimeInterval = 0
var correctedDate: Date {
    let possibleNow = Date()

    //Ignores network delay time same with or less than 2 seconds
    let now = abs(gap) > 2 ? possibleNow.advanced(by: gap) : possibleNow

    //For Debugging
    print("\(possibleNow) + \(gap) = \(now)")

    return now
}

func setServerDate() {
    let url = URL(string: "https://www.google.com")

    URLSession.shared.dataTask(with: url!) { _, response, _ in
        let httpResponse = response as? HTTPURLResponse
        if let contentType = httpResponse!.allHeaderFields["Date"] as? String {
            let formatter = DateFormatter()
            formatter.dateFormat = "EEE, dd MMM yyyy HH:mm:ss z"
            formatter.timeZone = TimeZone.current
            serverDate = formatter.date(from: contentType) ?? Date()
        } else {
            print("getting google server date failed")
            serverDate = Date()
        }
    }.resume()
}