ISO8601OptionalFractionalSecondsDateFormatter.swift

class ISO8601OptionalFractionalSecondsDateFormatter: ISO8601DateFormatter {

    static let withoutFractionalSeconds = ISO8601DateFormatter()

    func setup() {
        formatOptions =  [.withInternetDateTime, .withFractionalSeconds]
    }

    override init() {
        super.init()
        setup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }

    override func date(from string: String) -> Date? {
        if let result = super.date(from: string) {
            return result
        }
        return ISO8601OptionalFractionalSecondsDateFormatter.withoutFractionalSeconds.date(from: string)
    }

}