importing excel date value to DataTable

Question

I have a excel sheet where 4th column has date value sample values (1979-12-15 , 1975-05-04) when I import this excel sheet to DataTable, I am getting only the last part of these values like 15 , 04.

 

In the excel sheet, the 4 th column will only have date value but the number of rows is dynamic.

 

My code is::

class ExcelPackageExtenstions

public static class ExcelPackageExtenstions
    {
        //public ExcelPackageExtenstions() { }

        public static DataTable ToDataTable(this ExcelPackage package)
        {
            ExcelWorksheet workSheet = package.Workbook.Worksheets.First();
            DataTable table = new DataTable();
            foreach (var firstRowCell in workSheet.Cells[1, 1, 1, workSheet.Dimension.End.Column])
            {
                table.Columns.Add(firstRowCell.Text);
            }
            for (var rowNumber = 2; rowNumber <= workSheet.Dimension.End.Row; rowNumber++)
            {
                var row = workSheet.Cells[rowNumber, 1, rowNumber, workSheet.Dimension.End.Column];
                var newRow = table.NewRow();
                foreach (var cell in row)
                {
                    newRow[cell.Start.Column - 1] = cell.Text;
                }
                table.Rows.Add(newRow);
            }
            return table;
        }
    }

 aspx code

protected void Page_Load(object sender, EventArgs e)
        {
            if (IsPostBack && Upload.HasFile)
            {
                if(Path.GetExtension(Upload.FileName).Equals(".xlsx"))
                {
                    var excel = new ExcelPackage(Upload.FileContent);
                    var dt = excel.ToDataTable();
                    var table = "Test";
                    using (var conn = new SqlConnection("Server=.;Database=Test;Integrated Security=SSPI"))
                    {
                        //bulk copy code
                    }
                }
            }
        }

while debugging the class ExcelPackageExtenstions, I found that 

newRow[cell.Start.Column - 1] = cell.Text;

here I am getting the wrong value for date cells. How can I solve this problem ?