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]