Windows Service Start at a specific time

I want the service to start once daily and then process the parser but it is not processing the files.

The date-time is equal to the scheduled time I want the process to begin. I have the parser on a different class and the parser works perfectly; I only have a problem with the scheduler as you can see below.

What is that I am missing to make the program starts at the specified time?

using System;
using System.ServiceProcess;
using System.IO;
using System.Threading;
using System.Configuration;
using ASRParserService.Services;

namespace ASRParserService
{
public partial class Service1 : ServiceBase
{
    public Service1()
    {
        InitializeComponent();
    }

    protected override void OnStart(string[] args)
    {
        this.WriteToFile("Service started {0}");
        this.ScheduleService();
    }

    protected override void OnStop()
    {
        this.WriteToFile("Service stopped {0}");
        this.Schedular.Dispose();
    }
    private Timer Schedular;

    public void ScheduleService()
    {
        try
        {
            Schedular = new Timer(new TimerCallback(SchedularCallback));
            string mode = ConfigurationManager.AppSettings["Mode"].ToUpper();
            this.WriteToFile("Service Mode: " + mode + " {0}");

            //Set the Default Time.
            DateTime scheduledTime = DateTime.MinValue;

            if (mode == "DAILY")
            {
                //Get the Scheduled Time from AppSettings.
                scheduledTime = DateTime.Parse(ConfigurationManager.AppSettings["ScheduledTime"]);
                if (DateTime.Now > scheduledTime)
                {
                    //If Scheduled Time is passed set Schedule for the next day.
                    scheduledTime = scheduledTime.AddDays(1);              
                }
                else if(DateTime.Now < scheduledTime)
                {
                    this.WriteToFile("Service scheduled has past the time");
                }
                else
                {
                    DownloadFromSFTP downloadFromSFTP = new DownloadFromSFTP();
                    UploadToSFTP uploadToSFTP = new UploadToSFTP();
                    DeleteLocalFiles deleteLocalFiles = new DeleteLocalFiles();
                }

            }

            TimeSpan timeSpan = scheduledTime.Subtract(DateTime.Now);
            string schedule = string.Format("{0} day(s) {1} hour(s) {2} minute(s) {3} seconds(s)", timeSpan.Days, timeSpan.Hours, timeSpan.Minutes, timeSpan.Seconds);

            this.WriteToFile("Service scheduled to run after: " + schedule + " {0}");

            //Get the difference in Minutes between the Scheduled and Current Time.
            int dueTime = Convert.ToInt32(timeSpan.TotalMilliseconds);

            //Change the Timer's Due Time.
            Schedular.Change(dueTime, Timeout.Infinite);
        }
        catch (Exception ex)
        {
            WriteToFile("Service Error on: {0} " + ex.Message + ex.StackTrace);

            //Stop the Windows Service.
            using (ServiceController serviceController = new ServiceController("Service1"))
            {
                serviceController.Stop();
            }
        }
    }

    private void SchedularCallback(object e)
    {
        this.WriteToFile("Service Log: {0}");
        this.ScheduleService();
       
    }

    private void WriteToFile(string text)
    {
        string path = "C:\\EthiopianServices\\ServiceLog.txt";
        using (StreamWriter writer = new StreamWriter(path, true))
        {
            writer.WriteLine(string.Format(text, DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt")));
            writer.Close();
        }
    }
  }
}

below is the app setting

<appSettings>
    <add key ="Mode" value ="Daily"/>
    <add key ="IntervalMinutes" value ="1"/>
    <add key ="ScheduledTime" value ="13:50"/>
</appSettings>