Change Date Format in a DataGridView in C#

Question

I have a DataGridView called DGVpresale, it has all the data from a DataTable called presale

Here's how I'm filling it:

private void fillDGVpresale()
{
    try
    {
        DBconnection.Open();
    }
    catch 
    { }

    string  sqlQuery = "SELECT * FROM presale";
    using (MySqlDataAdapter da = new MySqlDataAdapter(sqlQuery, DBconnection))
    {
        using (DataTable dt = new DataTable())
        {
            da.Fill(dt);
            DGVpresale.DataSource = dt;
   
            DGVpresale.Columns["SELLER"].HeaderText = "Seller";
            DGVpresale.Columns["CLIENT"].HeaderText = "Client";
            DGVpresale.Columns["REGDATE"].HeaderText = "Registration Date";

            DGVpresale.Columns["SELLER"].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
            DGVpresale.Columns["CLIENT"].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
            DGVpresale.Columns["REGDATE"].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCellsExceptHeader;
        }
    }
}

I've translated table & column names and deleted some useless ones

There's a Date Column called REGDATE, which saves all dates in this format: yyyy-MM-dd

I want to change the format inside my DataGridView to dd/MM/yyyy

I tried this:

DGVpresale.Columns["REGDATE"].DefaultCellStyle.Format = "dd/MM/yyyy";

But nothing changes and I can't find any other way to do this.

I don't know if changes anything, but since I had an error when trying to fill the datagridview I had to add this to my DBconnection: convert zero datetime=True