incorrect date format representation

I working on excel date retrieving using ExcelDataReader. but it seem that i find issue with date column.

below is the image of excel data:

On retrieving using ExcelDataReader the date format is representing in number.

My code is :

 using (FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read))
                {
                    string fileExe = Path.GetExtension(FileUpload1.PostedFile.FileName);
                    IExcelDataReader excelReader;
                    if (fileExe == ".xls")
                    //1. Reading from a binary Excel file ('97-2003 format; *.xls)
                    {
                        excelReader = ExcelReaderFactory.CreateBinaryReader(stream, true);
                        //var excelReader = Excel.ExcelReaderFactory.CreateBinaryReader(inputStream, true);

                    }//...
                    //2. Reading from a OpenXml Excel file (2007 format; *.xlsx)
                    else
                    {
                        excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);
                    }
                    var excelDataSet = excelReader.AsDataSet(true);
                    //5. Data Reader methods
                    int j = 0;
                    while (excelReader.Read())
                    {
                        object[] array = new object[excelReader.FieldCount];
                        for (int i = 0; i < excelReader.FieldCount; i++)
                        {
                            if (j == 0)
                            {
                                dt.Columns.Add(i.ToString());
                            }
                            array[i] = excelReader.GetString(i);
                        }
                        j++;
                        dt.Rows.Add(array);
                    }
                    //6. Free resources (IExcelDataReader is IDisposable)
                    excelReader.Close();
                }

[nshanmugam]

Passing ‘true’ to the excelReader.AsDataSet method resolved the Date format issue for .xls files (into Dataset) . DataSet result = excelReader.AsDataSet(true);

[andersnm]

Looks like the dates are rendered as double because ConvertOaDates = false.