How to calculate total time from datatime datatype?

Hello Vijay,

You can refer the code below.

I mistakenly put TotalHours as int - but actually it is double.
You can take the sum of TotalHours and it seems to solve your problem.

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            IList list = new List();


            // login at 9am, team break at 10:30 am
            list.Add(new TimeEntry() { LoginTime = new DateTime(2011, 10, 31, 9, 0, 0), LogoutTime = new DateTime(2011, 10, 31, 10, 30, 0) });


            // login at 11am, lunch break at 1pm
            list.Add(new TimeEntry() { LoginTime = new DateTime(2011, 10, 31, 11, 0, 0), LogoutTime = new DateTime(2011, 10, 31, 13, 0, 0) });


            // login at 2pm, continuous work till 5pm
            list.Add(new TimeEntry() { LoginTime = new DateTime(2011, 10, 31, 14, 0, 0), LogoutTime = new DateTime(2011, 10, 31, 17, 0, 0) });


            // Calculate using loop
            double totalHours = 0;


            foreach (TimeEntry entry in list)
            {
                TimeSpan span = entry.LogoutTime - entry.LoginTime;
                totalHours += span.TotalHours;
            }


            // Display
            Console.WriteLine(string.Format("Total Time Worked: {0}", totalHours));
            Console.ReadKey(false);
        }
    }


    public class TimeEntry
    {
        public DateTime LoginTime;
        public DateTime LogoutTime;
    }
}



Please mark as answer if solved, else let me know.

Regards,
Jean Paul

Paul, I need to calculate the difference of login and logout time and sun of that difference.
for example, One student can login and logout times a day, i want to calculate the sum of time he ws there.

You can use the TimeSpan class.

Eg:
TimeSpan span = DateTime.Today - DateTime.Today.AddDays(-1);
int totalMinutes = span.TotalMinutes;
int totalHours = span.TotalHours;

You can also refer.

http://www.c-sharpcorner.com/UploadFile/DipalChoksi/DateDiff_CS_DC09132006172429PM/DateDiff_CS_DC.aspx

Regards,
JP