Hello,

Thank you for posting in our community.

I have created and attached a sample trying to reproduce the behavior that you described using the latest 2015.1 service release. The cell value for the date column contains only the row's date value.

If this is not an accurate demonstration of what you are trying to achieve please feel free to modify it and send it back to me.

0574.Sample.zip

Because you also don't need to use the following 'quick-fix' that is an known reported bug in this version:
www.infragistics.com/.../gridexcelexporter-uncaught-error-empty-color-cannot-be-used-to-create-a-workbookcolorinfo-instance

We already tried to replace all 'latest' tags in your sample with a specific version string without success ;-)

Your sample is using:

/*!@license Infragistics.Web.Loader 15.1.20151.2410 
* 
* Copyright (c) 2011-2016 Infragistics Inc. 
* 
* http://ko.infragistics.com/ 
* 
*/

We are using:

/*!@license Infragistics.Web.Loader 15.1.20151.1005 
* 
* Copyright (c) 2011-2015 Infragistics Inc. 
* 
* http://ko.infragistics.com/ 
* 
*/

This part is also not working in our version:

$.ig.loader({ 
scriptPath: "https://cdn-na.infragistics.com/igniteui/2015.1/latest/js/", 
cssPath: "https://cdn-na.infragistics.com/igniteui/2015.1/latest/css/", 
resources: "igGrid, igGridExcelExporter" 
});

We have to use the following code, because 'igGridExcelExporter' is not known:

$.ig.loader({
			scriptPath: "https://cdn-na.infragistics.com/igniteui/2015.1/latest/js/",
			cssPath: "https://cdn-na.infragistics.com/igniteui/2015.1/latest/css/",
			resources: "igGrid.*, igCombo, igEditors, modules/infragistics.util.js, modules/infragistics.documents.core.js, modules/infragistics.excel.js, modules/infragistics.gridexcelexporter.js"
		});

Can you create a sample with the exact same version that we have?

70678.Sample.zip