Format Report Runtime Date Display

I am currently working on a report that uses two runtime dates to return results.
The report works as expected; however, in the display header instead of the date/time entered the report shows a number string that does not allow the viewer to understand what date ranges were inputted.

I have tried to modify the HTML format with the $format(dateformat(…) to no avail.

I would appreciate assistance in how this data can be formatted or pointed to a resource that will enable me to format this “string” as a recognizable date. I have included a picture of the header for reference. Thank you.

Runtime%20date%20formatting