Support date formats on Excel exports

Related products: None

When we export data from GS it exports every date fields as a string value.  If it comes through as a CSV and when you open of the CSV it will convert this value naturally to a date type field.  However if it comes through as an excel (Downloaded directly) it will keep these as a string value.  We would like the ability to respect the date format when downloaded as an excel document.  

@chris_mudd sorry for the delayed response. The team is currently working on addressing this issue. With Reporting 3.0 we will be honoring date format for excel downloads.