Dates not exporting property from HTML5 2.5.2

It appears that the HTML5 viewer is manipulating date fields in such a way that they do not export to csv/excel as sortable dates. Specifically, HTML5 viewer is adding a comma between the date and the time.

 

My date field in ArcMap (FGDB)

 

 

How this looks in the Silverlight Viewer:

 

 

How this looks in the HTML5 Viewer:

 

 

As you can see, the Silverlight viewer is converting the empty time component to midnight and that makes sense (0:00:00) and it is not adding a comma between the date and the time. The HTML5 viewer, coming from the same data source, converts the midnight to 5 PM and inserts a comma. When this exports to CSV/XLSX, it includes this comma and is not sortable. The real problem is that comma. Does anyone know how to get that out of there? And to make sure it doesn't export to CSV/XLSX?