calculating time duration

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hi.. please check this code of mine:

protected void Button4_Click(object sender, EventArgs e)
    {
        DateTime dt1;
        DateTime dt2;

        string currenttime1 = DateTime.Now.ToLongTimeString();
        string currenttime2 = DateTime.Now.ToLongTimeString();
        TextBox2.Text = currenttime2;

        dt1 = Convert.ToDateTime(currenttime1);
        dt2 = Convert.ToDateTime(currenttime2);
       
        TimeSpan ts = dt1 - dt2;

        int hours = ts.Hours;
        int min = ts.Minutes;

        string finalMin = Convert.ToString(min);

        TextBox3.Text = finalMin;

---- i'm having a web page that calculated time duration when the user press the stop button.. but the output of this code is always zero.. what is my error?
thanks in advance.. :)
--im using asp.net and C# :confused:

Posted 3-Apr-10 3:02am

Heaven23

Updated 3-Apr-10 3:09am

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DaveyM69 · Answer 1 · 2010-04-03T03:33:00

This is a quick console application which you can adapt to your ASP.NET page.

C#

using System;

namespace TimeDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime now = DateTime.Now;
            DateTime earlier = now.AddHours(-1);
            Console.WriteLine("Now: {0}", now.ToLongTimeString());
            Console.WriteLine("Earlier: {0}", earlier.ToLongTimeString());

            TimeSpan duration = now - earlier;
            Console.WriteLine("Duration {0} minutes", duration.TotalMinutes);

            Console.ReadKey();
        }
    }
}

Not Active · Answer 2 · 2010-04-03T03:14:00

You are comparing two times retrieved at virtually the same instance, of course the difference will be 0

Heaven23 wrote:
dt1 = Convert.ToDateTime(currenttime1);
dt2 = Convert.ToDateTime(currenttime2);

This bit is absolutely useless. You are getting the current DateTime, converting it to a string, then converting back to a DateTime. :rolleyes: Useless.

calculating time duration

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