Abstract: A time of top-over indicator includes a mercury tilt switch connecting a battery to a digital clock with a clock display. The assembly is positioned on structure subject to tilting, such as a refuse container emptied by tilting. When a change of switch state occurs because of tilting of the tilt switch, the clock causes the display to change in such a manner as to indicate the time of occurrence of the tilting operation. In a preferred embodiment, the clock updates the display to show the time of occurrence of the tilting of the container and so maintains the display until the next occurrence of tilting. Alternatively, the clock is reset and restarted in response to the tilting of the container and displays the elapsed time since tilting of the container occurred.