Winform导出到Excel-XLWorkbook-日期和时间数字格式

我的要求是-

我必须将Datatable导出到.xls文件
对于Datatable中的所有日期列，excel单元格应为Date格式，而不是"文本"或"常规"。这是因为，用户可以根据需要根据日期筛选数据

我的代码

Microsoft.Office.Interop.Excel.Application ExcelApp = new Microsoft.Office.Interop.Excel.Application();
Workbook xlWorkBook = ExcelApp.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
StringBuilder sb = new StringBuilder();
sb.Append("<html><body>");
sb.Append("<table style='border: 1px solid black;'>");
var index = 1;
sb.Append("<tr>");
sb.Append("<th colspan='9'>SANJAY MALAKIYA</th>");
sb.Append("</tr>");
sb.Append("<tr></tr>");
sb.Append("<tr>");
sb.Append("<td colspan='9'><b>SANJAY</td>");
sb.Append("</tr>");
sb.Append("<tr>");
sb.Append("<td style='border: 1px solid black'>SrNO</td>");
foreach (DataColumn column in dtDataTable1.Columns)
{
sb.Append("<td style='border: 1px solid black'>" + column.ColumnName + "</td>");
}
sb.Append("</tr>");
ExcelApp.Windows.Application.ActiveWindow.DisplayGridlines = false;
StringBuilder objSB = new StringBuilder();
foreach (DataRow row in dtDataTable1.Rows)
{
sb.Append("<tr>");
sb.Append("<td style='width:100px;border: 1px solid black'>" + index.ToString() + "</td>");
foreach (DataColumn column in dtDataTable1.Columns)
{
sb.Append("<td style='width:100px;border: 1px solid black'>" + row[column.ColumnName].ToString() + "</td>");
}
index++;
sb.Append("</tr>");
}
if (dtDataTable1.Rows.Count > 0)
{

ExcelApp.Columns.AutoFit();
}
sb.Append("</table>");
sb.Append("</body></html>");
String Todaysdate = DateTime.Now.ToString("dd-MM-yyyy");
if (!Directory.Exists("C:\Users\Krupal\Desktop\" + Todaysdate))
{
Directory.CreateDirectory("C:\Users\Krupal\Desktop\" + Todaysdate);
}
using (System.IO.StreamWriter file = new System.IO.StreamWriter("C:\Users\Krupal\Desktop\" + Todaysdate + "\Summury_final " + Convert.ToDateTime(cmbmonth.SelectedItem).ToString("dd/MM/yyyy") + ".XLS"))
{
file.WriteLine(sb.ToString());
}
Microsoft.Office.Interop.Excel.Application Excel = new Microsoft.Office.Interop.Excel.Application();
Workbook xlWorkBook1 = ExcelApp.Workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
xlWorkBook1 = Excel.Workbooks.Open("C:\Users\Krupal\Desktop\" + Todaysdate + "\Summury_final " + Convert.ToDateTime(cmbmonth.SelectedItem).ToString("dd/MM/yyyy") + ".XLS", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "t", false, false, 0, true, 1, 0);
Microsoft.Office.Interop.Excel.Worksheet Wt = (Excel.Worksheet)xlWorkBook1.Worksheets.get_Item(1);
Excel.Visible = true;

您可以设置如下的日期格式

Range rg = (Excel.Range)worksheetobject.Cells[1,1];
rg.EntireColumn.NumberFormat = "MM/DD/YYYY";

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