Question

In excel sheet i have date in format dd.MM.yyyy 16.10.2011 (16 as dd, 10 as MM). When i’m importing data from excel to SQL Server 2008 i get MM.dd.yyyy but still 16.10.2011 (16 as MM, 10 as dd). That’s not correct. I found solution on this: go to SQL Server 2008 -> Security -> logins -> {user properties} -> and change default language for user. With this solution i get in SQL Server 2008 dd.MM.yyyy 16.10.2011 (16 as dd, 10 as MM). Is there any other way to convert date in dd.MM.yyyy format without changing user language?

String sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\JantarV7Export.xlsx;Extended Properties=Excel 8.0";
OleDbConnection olecon = new OleDbConnection(sConnectionString);

olecon.Open();
OleDbCommand cmd = olecon.CreateCommand();
cmd.CommandText = "SELECT person_id, date_of_hours, number_of_hours FROM [Sheet1$]";                    
OleDbDataAdapter oda = new OleDbDataAdapter(cmd);
OleDbDataReader odr = cmd.ExecuteReader();
conn.Open();
while (odr.Read())
{
    SqlCommand cmd1 = conn.CreateCommand();

    cmd1.CommandText = "INSERT INTO test_data values (newid(),'" + odr[0] + "',@date_of_hours,'" + odr[2] + "')";
    cmd1.Parameters.Add("@date_of_hours", SqlDbType.DateTime).Value =odr[1];
}
cmd1.ExecuteNonQuery();
olecon.Close();
conn.Close();

I think that problem is when i’m inserting into test_data datatable. So i probably should convert dates somehow before inserting. What do you suggest? Thanks. Is there any options like this:

cmd1.CommandText = "INSERT INTO test_data values (newid(),'" + odr[0] + 
    "',CONVERT(VARCHAR(20),@date_of_hours,104),'" + odr[2] + "')";
cmd1.Parameters.Add("@date_of_hours", SqlDbType.DateTime).Value =odr[1];

(this doesn’t work because of CONVERT in insert, but is there some similar solution) or

CONVERT(VARCHAR(20),@date_of_hours,104) AS [DD:MM:YYYY]

UPDATE
In other form i read data through combobox. It shows 1.10.2011, 2.10.2011, …. to 16.10.2011.

da_test_data = new SqlDataAdapter("SELECT test_data_id, date_of_hours, number_of_hours FROM test_data WHERE _person_id= '" + person_id_person + "' ORDER BY date_of_hours", conn);
dt_test_data = new DataTable();
da_test_data.Fill(dt_test_data);
cb_datum.DataSource = dt_test_data.DefaultView;
cb_datum.ValueMember = "test_data_id";
cb_datum.DisplayMember = "date_of_hours";

And combobox for projects:

 private void cb_datum_SelectedIndexChanged(object sender, EventArgs e)
 {
      DataRowView drvProjekt = cb_datum.SelectedItem as DataRowView;
      if (drvProjekt != null)
      {
          string date1 = drvProjekt["date_of_hours"].ToString();  
          DateTime date2 = new DateTime();
          date2 =Convert.ToDateTime(date1);

          //DateTime date = DateTime.ParseExact(date1, "MMddyyyy hh:mm:ss", null);
          //DateTime date = DateTime.ParseExact(date1, "dd.MM.yyyy", System.Globalization.CultureInfo.CurrentUICulture.DateTimeFormat);

          //object obj = DateTime.ParseExact(dddd, "MM/dd/yyyy hh:mm", null);
          conn = new SqlConnection(connectionString);
          conn.Open();

          da_projekt = new SqlDataAdapter("SELECT projekt_id, name_of_projekt, date_of_start, date_of_end FROM projekt WHERE date_of_start < '" + date2 + "' AND date_of_end > '" + date2 + "' ", conn);
          dt_projekt = new DataTable();
          da_projekt.Fill(dt_projekt);
          cb_projekt_id.DataSource = dt_projekt.DefaultView;
          cb_projekt_id.ValueMember = "projekt_id";
          cb_projekt_id.DisplayMember = "name_of_projekt";
          conn.Close();
      }
 }

When i select 13.10.2011 i get error. Date is recognised as MM.dd.yyyy. I tried everything (all in comments and many more). Yust don’t find a solution.

Answer 1

As I mentioned in the comment. your date value is stored as Date in SQL. So when you store date in SQL it will remain date only, and when you retrieve it you will get date object directly. In SQL, it might be displayed as MM.dd.yyyy it doesn’t matter.

When you will read this data from SQL, you will get DateTime object, on this if you do .ToString("dd.MM.yyyy", CultureInfo.InvariantCulture) you will get in dd.MM.yyyy format. You can use any format on DateTime object, read more about it on MSDN.

Hope this answers your question.