AsyncFunctions.RxTest.rxCreateTimer C# (CSharp) Method

        public static object rxCreateTimer(int intervalSeconds)
        {
            return RxExcel.Observe("rxCreateTimer", intervalSeconds,
            () => Observable.Create<string>(
                observer =>
                {
                    var timer = new System.Timers.Timer();
                    timer.Interval = intervalSeconds * 1000;
                    timer.Elapsed += (s, e) => observer.OnNext("Tick at" + DateTime.Now.ToString("HH:mm:ss.fff"));
                    timer.Start();
                    return timer;
                }));
        }