I have problem with time column and exporting the grid to excel.
The column is DateTime field and i aplly format to it 'Format="HH:mm:ss"'. The data is displayed properly in the grid but when I export the grid to excel it doesn't apply the correct format and display Date + Time instead only Time (as on the page).
Double check that your column Data Type is set to DateTime. Also, you can override every aspect of the export process, including the export of a given cell. You'll want to use the CellExported event shown here - http://help.infragistics.com/Help/NetAdvantage/NET/2007.3/CLR2.0/html/Infragistics2.WebUI.UltraWebGrid.ExcelExport.v7.3~Infragistics.WebUI.UltraWebGrid.ExcelExport.UltraWebGridExcelExporter~CellExported_EV.html
Hope this helps,
-Tony