how to calculate time difference in c#

Below is my code i wrote for myself, to find the difference between current time and given time, which return the difference in miliseconds, i use it for timer from current time to any upcoming time i write in 24 hours format 

using System;

class Program

{

    static void Main() {

        double diff = timeDifferenceInMilliseconds(16,0,0);

        System.Console.WriteLine("Difference recieved: "+ diff);

    }

    public static double timeDifferenceInMilliseconds(int hours, int minutes, int seconds){

        DateTime currentTime = DateTime.Now;

        DateTime myTime = new DateTime(currentTime.Year, currentTime.Month, currentTime.Day, hours,minutes,seconds);

        TimeSpan timeDifference = myTime.Subtract(currentTime);

        return (timeDifference.TotalMilliseconds < 0) ? timeDifference.TotalMilliseconds+24*3600000 : timeDifference.TotalMilliseconds;      

    }

}