当我把GrideView中的数据导出到Excel 时，如果时汉字和数字，字母都能正常，但是但GrideView中含有日期类型时，却什么都倒不出，GridView数据格式为： 02 21 2009 2：37PM      1          大河报，生成代码如下：

 Response.Clear();
  Response.Buffer = false;
  Response.Charset = "UTF-8";
  Response.AppendHeader("Content-Disposition", "attachment;filename=pkmv_de.xls");
  Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
  Response.ContentType = "application/ms-excel";
  Response.Write("<meta http-equiv=Content-Type content=\"text/html; charset=UTF-8\">");//防止输出乱码
  this.EnableViewState = false;
  System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
  HtmlTextWriter oHtmlTextWriter = new HtmlTextWriter(oStringWriter);
  GridView1.RenderControl(oHtmlTextWriter);
  Response.Write(oStringWriter.ToString());
  Response.End();

请那位高手给解决下。