C# 从 SQL Server 更改日期格式

Question

I'm relatively new to C#, SQL Server, and Stackoverflow.

I want the format of my date to stay the same from SQL Server to my C# code. I have a screenshot of the SQL Server table:

.

I just want the format to stay the same. I want the format to stay yyyy-mm-dd instead when I retrieve the data the format is dd/mm/yyyy 0:00:00 .

I then use the following code to retrieve the data from the server:

ArrayList a = new ArrayList(); 
DataTable d = new DataTable();         
string sql = "SELECT * FROM myServer";

MySql.Data.MySqlClient.MySqlCommand cmd = new MySql.Data.MySqlClient.MySqlCommand(sql, conn);
MySqlDataAdapter myA = new MySqlDataAdapter(cmd);

myA.Fill(d);
cmd.ExecuteNonQuery();

foreach (DataRow row in d.Rows)
{
    FitnessManager f = new FitnessManager();
    f.testDate = row["testDate"].ToString();
    f.tDate = row["tDate"].ToString();
    f.dtDate = row["dtDate"].ToString(); 
    a.Add(f);
}

return a;

I would expect the results in the ArrayList to be 2020-10-13 , instead I'm getting 10/11/2020 0:00:00 .

I do not know why this happens for how to fix this.

Answer 1

You would do something like this:

  f.tDate = row["tDate"].ToString("yyyy-MM-dd")

The ToString() function accepts a format string, so you can pretty much convert it to whatever format you want.

More information here:

https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings

Answer 2

I found a previous post that helped me out a lot.

Change date format in C# when reading from database and setting to label I needed to specify that the data being formatted was datatime rather than ToString() being called as an object.

Thanks EJ for putting me on the right track.