Date Only on Formula Field

I have a form with a date field, not a date-time field, and a formula field that references that date field. The formula uses date_field.addDay(7) to add 7 days to it. That formula works, however it is formatted as a date-time filed in reports. I need the field to only show the date in reports, without the time. The 00:00:00 time stamp is not only unnecessary, but it takes up too much space on the report and is inconsistent with the rest of the date only fields in the report.