How to calculate no of day

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<tr>
<td valign="top" align="center">Training Date</td>
<td valign="top" align="left"><b>FROM</b>&nbsp;&nbsp;&nbsp;
    <asp:TextBox ID="txtDatefrom" runat="server" Width="240px" Height="30px"></asp:TextBox>

    <asp:Image ID="imgDatefrom" runat="server" ImageUrl="~/img/cal.gif" />
     <cc1:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" runat="server"
        TargetControlID="txtDatefrom" WatermarkText="1/1/2001">
    </cc1:TextBoxWatermarkExtender>
    <cc1:CalendarExtender ID="CalendarExtender1" runat="server" PopupButtonID="imgDatefrom" TargetControlID="txtDatefrom" PopupPosition="TopRight"  >
    </cc1:CalendarExtender>
</td>
<td valign="top" colspan="5" align="left"><b>TO</b>&nbsp;&nbsp;&nbsp;
    <asp:TextBox ID="txtDateto" runat="server" Width="300px" Height="30px"></asp:TextBox>
    <asp:Image ID="imgDateto" runat="server" ImageUrl="~/img/cal.gif" />
    <cc1:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender2" runat="server"
        TargetControlID="txtDateto" WatermarkText="1/1/2001">
    </cc1:TextBoxWatermarkExtender>
    <cc1:CalendarExtender ID="CalendarExtender2" runat="server" PopupButtonID="imgDateto" TargetControlID="txtDateto" PopupPosition="TopRight" >
    </cc1:CalendarExtender>
</td>
</tr>

<tr>
<td valign="top" align="center">No of Days(in numeric)</td>
<td valign="top" colspan="6" align="left">
    <asp:TextBox ID="txtNoofdays" runat="server" Width="300px" Height="30px"></asp:TextBox>
</tr>

in .CS

C#

public void InsertData()
      {
          string fromdate = System.DateTime.Now.ToString();
          txtDatefrom.Text = Convert.ToDateTime(fromdate).ToString();
          string todate = System.DateTime.Now.ToString();
          txtDateto.Text = Convert.ToDateTime(todate).ToString();
          string noofday = 

da = new SqlDataAdapter("Insert Into Feedback_training(From_training_date,To_training_date,Noof_days)values('" + txtDatefrom.Text + "','" + txtDateto.Text + "','"+noofday+"')", con);
            ds = new DataSet();
            da.Fill(ds);

NOTE :- i have already insert the value of fromdate and todate. i wanted the no of days records and stored in database (how to diff b/w fromdate and todate) i have already one column no of days in database and datatype is int

Posted 9-Dec-13 21:55pm

ashishmagneti

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4 solutions

Solution 1

Hi Try this..

.Days will gives you the diff in integer whole number.

C#

DateTime dtFrom = DateTime.Now.AddDays(-5);
            DateTime dtTo = DateTime.Now; 
            int NoOfDays = (dtTo - dtFrom).Days;

TotalDays will gives you result in double including the time hours

C#

DateTime dtFrom = DateTime.Now.AddDays(-5);
            DateTime dtTo = DateTime.Now.AddHours(6);
            double  NoOfDays = (dtTo - dtFrom).TotalDays;

Posted 9-Dec-13 22:04pm

Karthik_Mahalingam

Updated 9-Dec-13 22:08pm

v2

Solution 2

See Code

string noofday = (System.DateTime.Now - Convert.ToDateTime(fromdate)).TotalDays.ToString();

Note that I used the TotalDays property to get the number of days in between. This gets me the number of days putting in consideration the years with fraction days (years with 366 days). I could also use the property "Days" that would get me the value considering that all the years consist of 365 days only.

Posted 9-Dec-13 22:04pm

sankarsan parida

Updated 9-Dec-13 22:13pm

v3

Solution 3

First off, don't do that! Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

Pass the DateTime values directly, and the number of days directly as numbers - don't play around with converting the to strings, because that just introduces errors when you SQL server is not configured the same as the Web server.

To Calculate the number of days is simple:

C#

int noOfDays = (todate - fromdate).Days;

Posted 9-Dec-13 22:07pm

OriginalGriff

Comments

Karthik_Mahalingam 10-Dec-13 4:15am

good information..

ashishmagneti 10-Dec-13 4:15am

days does not support

OriginalGriff 10-Dec-13 4:51am

Um. Yes it does - show the exact code you used, and the error message the compiler gives.

ashishmagneti 10-Dec-13 4:17am

i will have to add any name space for days bocz .days not support

[no name] 10-Dec-13 4:44am

You have already one column no of days in database and datatype is int. And you code for string.
For this
You need to change parameter format also
int noofday = Convert.ToInt32((Convert.ToDateTime(DateTime.Now.AddMonths(2)) - System.DateTime.Now).TotalDays);....
And query.....
values('" + txtDatefrom.Text + "','" + txtDateto.Text + "',"+noofday+")", con);

OriginalGriff 10-Dec-13 4:51am

Bad - that is even worse than the original, because it leaves him wide open to SQL injection - you are passing the exact string the user entered unchanged to SQL...

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Simon_Whale · Accepted Answer · 2013-12-09T22:27:00

Firstly I would change some of your code.

1. I would change this

Quote:
string fromdate = System.DateTime.Now.ToString();
txtDatefrom.Text = Convert.ToDateTime(fromdate).ToString();
string todate = System.DateTime.Now.ToString();
txtDateto.Text = Convert.ToDateTime(todate).ToString();

to

C#

 DateTime ToDate = DateTime.Now;
 DateTime FromDate = Convert.Todate("21/10/2013");

 txtDateFrom.Text = FromDate.ToShortString();
 txtDateTo.Text = ToDate.ToShortString();

TimeSpan ts = FromDate - ToDate;
int NoDays = ts.Days;

2. Secondly I would change you insert Query to use parameterised queries.

http://social.msdn.microsoft.com/Forums/en-US/ad526a4b-61af-4f99-b6f1-2c0752006541/parameterized-query-and-adonet[^]