The invention provides an apparatus for diarizing the performance of janitorial services that includes an electronic display unit for indicating when a service was last completed and an input device for signalling when the display is to be updated. The apparatus can include a chassis mountable on a wall of a facility being maintained by a janitorial service, and at least one electronic display framed by a window on said chassis, said chassis for displaying a time when said facility was last maintained. The apparatus can also include a central processing unit connected to said display and for updating the display based on a user-input received from an input device that is mounted to said chassis and connected to the central processing unit. The input device is actuated at a time that is substantially coterminous when said facility was last maintained.