Currently, DisplayFormatType.GeneralDate, DisplayFormatType.ShortDate, DisplayFormatType.MediumDate all return culture's DateTimeFormat.ShortDatePattern. Workaround: GridViewDateTimeColumn columnDateTime = this.radGridView1.Columns["Date"] as GridViewDateTimeColumn; columnDateTime.ExcelExportType = DisplayFormatType.Custom; columnDateTime.ExcelExportFormatString = "dd/MM/yyyy hh:mm:ss";
We will add two predefined date time formats ShortDateTime and LongDateTime with Telerik UI for WinForms R3 2017. Bear in mind that you can set the ExcelExportType property of the specific column to Custom and specify the ExcelExportFormatString property with the desired format. The following help article is quite useful for specifying the desired format: Format Codes (http://docs.telerik.com/devtools/document-processing/libraries/radspreadprocessing/features/format-codes)