iOS ISO8601 Date JSON Decoder

ISO8601DateJSONDecoder.swift

let jsonDecoder: JSONDecoder = {
    let decoder = JSONDecoder()
    decoder.dateDecodingStrategy = .custom { decoder in
        let container = try decoder.singleValueContainer()
        let string = try container.decode(String.self)
        let formatter1 = ISO8601DateFormatter()
        formatter1.formatOptions = [.withInternetDateTime]
        let formatter2 = ISO8601DateFormatter()
        formatter2.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
        guard let date = formatter1.date(from: string) ?? formatter2.date(from: string) else {
            throw DecodingError.dataCorruptedError(in: container, debugDescription: "Cannot decode date string \(string)")
        }
        return date
    }

    return decoder
}()