Search Reports- Date Variable?

I just set up a search report for “Work Completed Today”… I wanted a report to view not only completed tasks but any task I maintained, or applied time to (using custom fields). I could then see how my day went overall with actual time spent on work. However, instead of refining the report each day to change the “date maintained” value to the current day, it would be nice if I could use a variable value for the “modified” date. Ex. [Today]

I have created a similar report for tasks that were completed by me today, so I would like to see the same thing for the “Date completed” value. When I put in [Today], it would be helpful if this date were automatically updated each day so I don’t have to re-create the report.