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System.Timers.Timer serviceTimer;        

        public Service1()
        {
            InitializeComponent();

            serviceTimer  = new System.Timers.Timer();
            serviceTimer.Elapsed += new ElapsedEventHandler(timer_Tick);
            serviceTimer.Interval = Double.Parse(ConfigurationManager.AppSettings.Get("timer")); // hole ich aus der app config, falls man es später anpassen möchte. VALUE ist 60000
        }

        protected override void OnStart(string[] args)
        {
            serviceTimer.Start();
        }

        protected override void OnStop()
        {
        }

        void timer_Tick(object sender, EventArgs e)
        {
            DoSomething();
        }

        private void DoSomething()
        {
            // Funktionen 
        }					

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            DateTime dtime = DateTime.Now;
            string zeit = dtime.ToString("Datum: dd.MM.yyyy  Uhrzeit: HH:mm:ss");
            StreamWriter sw = new StreamWriter(@"C:\Log\LogFile.log", true);
            sw.WriteLine(zeit);
            sw.Close();