excute the system.threading.timer daily at fixed timing

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.NET3.5

C#

.NET

threads

I want to excute the system.threading.timer daily at fixed timing. I have used the following code

using System;  
using System.Threading;  
public static class Program  
{  
    static void Main(string[] args)  
    {  
        // get today's date at 10:00 AM  
        DateTime tenAM = DateTime.Today.AddHours(10);  
 
        // if 10:00 AM has passed, get tomorrow at 10:00 AM  
        if (DateTime.Now > tenAM)  
            tenAM = tenAM.AddDays(1);  
 
        // calculate milliseconds until the next 10:00 AM.  
        int timeToFirstExecution = (int)tenAM.Subtract(DateTime.Now).TotalMilliseconds;  
 
        // calculate the number of milliseconds in 24 hours.   
        int timeBetweenCalls =  (int)new TimeSpan(24, 0, 0).TotalMilliseconds;  
 
        // set the method to execute when the timer executes.   
        TimerCallback methodToExecute = ProcessFile;  
 
        // start the timer.  The timer will execute "ProcessFile" when the number of seconds between now and   
        // the next 10:00 AM elapse.  After that, it will execute every 24 hours.   
        System.Threading.Timer timer = new System.Threading.Timer(methodToExecute, null, timeToFirstExecution, timeBetweenCalls );  
 
        // Block the main thread forever.  The timer will continue to execute.   
        Thread.Sleep(Timeout.Infinite);  
    }  
 
    public static void ProcessFile(object obj)  
    {  
        // do your processing here.   
    }  
} 

i want to test this code but when i will excute the first time timer at 01-11-2011 10:00:00 it will excute then i have change the date & time to 02-11-2011 09:59:00 but it will not execute at 02-11-2011 10:00:00 how to test this code?