Remove time in itextsharp pdf document

Question

Remove time in itextsharp pdf document  

08.04.2018  12:44:21 datetime now

08.04.2018  I need..

//Adding DataRow
            foreach (DataGridViewRow row in mp_faktura_listaDataGridView.Rows)
            {

                foreach (DataGridViewCell cell in row.Cells)
                {

                    PdfPCell cell2 = new PdfPCell(new Phrase(cell.Value.ToString(), calibri));

                    pdfTable.AddCell(cell2);
                }
            }

I try this 

//Adding DataRow
            foreach (DataGridViewRow row in mp_faktura_listaDataGridView.Rows)
            {

                foreach (DataGridViewCell cell in row.Cells)
                {
                   string dateVal = cell.Value.ToString().Split(',')[0];
                   PdfPCell cell2 = new PdfPCell(new Phrase(dateVal, calibri));

                }
            }

But dont work