C# - How To Remote Web Site Day And Month Reverse When Less Than Day 12 In Excel

Local machine visual studio day and month are normal in format dd/mm/yyyy. But after deployed to remote web site, saved Excel using C#, less than day 12, become mm/dd/yyyy.

Actually the code is to get data into Excel from stored procedure which do pivot table The way i save date to cell is oSheet.Cells[currentline, i + 1] = String.Format("{0:dd-MM-yyyy}", Convert.ToDateTime(reader[i].ToString()));

while (reader.Read())
{
for (int i = 0; i < reader.FieldCount; i++)
{
if (reader[i] != System.DBNull.Value)
{
if (i == 0)
{
oSheet.Cells[currentline, i + 1] = String.Format("{0:dd-MM-yyyy}", Convert.ToDateTime(reader[i].ToString()));
}
else
oSheet.Cells[currentline, i + 1] = reader[i].ToString();
}
}
currentline = currentline + 1;
}
reader.Close();
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>
</dependentAssembly>
</assemblyBinding>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Microsoft.Office.Interop.Excel"
publicKeyToken="71e9bce111e9429c"
culture="neutral" />
<publisherPolicy apply="yes" />
<bindingRedirect oldVersion="12.0.0.0"
newVersion="11.0.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>