Convert JavaScript dates and Swift

gistfile1.txt

 // REMARK: format date for better display
    func convertDate(date: Date) -> String? {
        let dateFormatterGet = DateFormatter()
        dateFormatterGet.dateFormat = "yyyyMMdd HH:mm:ss"
        let dateString = dateFormatterGet.string(from: date)
            return dateString
    }
    
    // REMARK: server sends dates on JS string format
    func convertJSDate(date: String) -> String? {
        let dateFormatterGet = DateFormatter()
        dateFormatterGet.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
        if let date = dateFormatterGet.date(from: date) {
            return convertDate(date: date)
        }
        return nil
    }