How to auto calculate number of days using vb.net

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my form:
https://scontent-b-hkg.xx.fbcdn.net/hphotos-prn2/t1.0-9/1536719_838907672791325_1190841649_n.jpg

VB

DueDateTimePicker.Value = DateTime.Now.AddDays(txtNumOfDays.Text)

above code works during txtNumOfDays text changed.this will set the duedate starting from issued date.

what i want is during DueDateTimePicker value changed, txtNumOfDays will auto calculate between issued date and due date. For example, todays date is 25 user set the due date to 26 then number of days answer is 1.Please help still a newbiew

Posted 24-Mar-14 17:53pm

akosisugar

Updated 24-Mar-14 17:55pm

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syed shanu · Answer 1 · 2014-03-24T18:19:00

Solution 1

Try this

C#

 private void dateTimePicker2_ValueChanged(object sender, EventArgs e)
        {
            DateTime arrivaldate  = dateTimePicker1.Value;
DateTime departuredate = dateTimePicker2.Value;
            double DaysStayed = departuredate.Subtract(arrivaldate).TotalDays;

        }

Posted 24-Mar-14 18:19pm

syed shanu

Comments

akosisugar 25-Mar-14 0:52am

tNx. just edited your code and now i can continue my project.

Marcin Kozub · Answer 2 · 2014-03-25T00:07:00

Hello,

Considering values of DateTimePicker controls:

C#

dtpDueDate.Value = 2014-03-25 15:39:12
dtpIssuedDate.Value = 2014-03-27 14:11:15

Substracting two DateTime objects will give you result in TimeSpan struct. If your date objects contains Time part you will get exact difference between two dates. In this case it will be:
1.22:32:03 (1 day, 22 hours, 32 minutes and 3 seconds)

Solution 1:

C#

TimeSpan timeSpan = dtpDueDate.Value - dtpIssuedDate.Value;
// 1. This code will result something like this: 1 (only days)
txtNumOfDays.Text = timeSpan.Days.ToString();
// 2. This code will result something like this: 1,93892361111111
txtNumOfDays.Text = timeSpan.TotalDays.ToString();

Solution 2:
If you wish to get only days difference without comparing TimePart use DateTime.Date:

C#

// dtpDueDate: 2014-03-25 00:00:00
// dtpIssuedDate: 2014-03-26 00:00:00
TimeSpan timeSpan2 = dtpDueDate.Value.Date - dtpIssuedDate.Value.Date;
// 1. This code will result something like this: 2
txtNumOfDays.Text = timeSpan2.TotalDays.ToString();

TimeSpan info:
http://msdn.microsoft.com/library/system.timespan%28v=vs.110%29.aspx[^]
DateTime info:
http://msdn.microsoft.com/library/system.datetime.aspx[^]

I hope it helps you :)