There seems to be no way in jD to search or select downloads by a date range based on their creation or modified dates. 
Think this would need to be a new module to set a date range and whether the created or modified date range.

The Start Date would select a time at midnight on the day eg 00-00-00 and the end date could select a time just before midnight of the day eg 23-59-59 so that searches would work for a single day.
Colin