Convert a column from "Short Date" to "Long Date"

Hi,

I have two columns defined as DateTime type in the Visual Designer,
i.e., Dataset.xsd.

In the grid to which the columns are bound, they're both displayed as
date, for instance, 5/23/2007. It seems that they're using the default
"short date" format.

I want to use the "long date" format to display the actual hour/minute/
second in one column while keeping the other column as it is ("short
date"). Anyone can advise me on how to change one of the columns to
"long date"?

Thanks!