How to calculate and check Time Span

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Please can anyone help me for the following?

I want to calculate time span in 9:00 AM to 11:00 AM and then checking this interval time span

I chose First Combo box in 9:00, Second Combo box in AM or PM, Third Combo box in 11:00 and Fourth Combo Box in AM or PM. and then using string.Format("{0} {1} {2} {3} {4}", FirstCombo.Text, SecondCombo.Text, "To", ThirdCombo.Text, FourthCombo.Text)

Resut are 9:00 AM To 11:00 AM

I will check this time interval are always including in 2 hours.

Posted 12-Sep-12 19:11pm

hein thu

Updated 12-Sep-12 19:13pm

v2

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Mohamed Mitwalli · Accepted Answer · 2012-09-12T19:32:00

Hi ,
Check this
To calculate the time

C#

DateTime dt = Convert.ToDateTime("9:00");
            DateTime dt2 = Convert.ToDateTime("11:00");

            TimeSpan ts = dt2 - dt;
            MessageBox.Show( ts.TotalMinutes.ToString());

http://www.dotnetspider.com/resources/458-How-find-difference-between-two-Dates-C-or.aspx[^]
http://msdn.microsoft.com/en-us/library/aa287590%28v=vs.71%29.aspx[^]
Best Regards
M.Mitwalli

Swinkaran · Accepted Answer · 2012-09-12T20:28:00

The solution I provide below has 4 combo boxes as you explained in your question. In this solution, I am first converting the time to 24 hours format(depending on "AM" or "PM" is selected) and then comparing both the inputs.

The below is a button click event which will check the hours difference,

private void btnCheckTime_Click(object sender, EventArgs e)
       {
           //Get the start time and convert to int (int 24 hours)
           DateTime iStartTime = Get24Hours(cmbStartTime.Text, cmbStartampm.Text);
           //Get the end time and convert to int (in 24 hours)
           DateTime iEndTime = Get24Hours(cmbEndTime.Text, cmbEndampm.Text);

           //Find the difference
           TimeSpan time_difference = iEndTime - iStartTime;
           int hours_diff=Convert.ToInt16(time_difference.Hours);

           //Now check for 2 hours
           if (hours_diff != 2)
           {
               //this is not 2 hours. Not valid
           }

           else {
               //This is 2 hours. Valid
           }
       }

This function will convert the input hours to 24 hour format. So, always the values of hours are between 0-24.

private DateTime Get24Hours(string time, string ampm)
       {
           DateTime TheTime = Convert.ToDateTime(time);

           if (ampm.Equals("PM"))
           {
               DateTime TheTimePM = TheTime.AddHours(12);
               return TheTimePM;
           }

           return TheTime;
       }

Try this solution and let me know if you have any difficulties.

thank you.

How to calculate and check Time Span

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