Abstract: A day and night depicting clock device for demonstrating daytime and nighttime on a clock. The device includes a clock having a clock face wall and an hour drive shaft rotating once every twelve hours. A first disk is mounted on the hour drive shaft for rotation with the hour drive shaft, has a radially extending first slot, is formed of a resiliently flexible material to permit flexing of a portion of the first disk, and has a relatively light color to identify a daytime period. A second disk is positioned behind the first disk, is fixed against rotation with respect to the clock face wall, has a radially-extending second slot, is formed from a resiliently flexible material to permit flexing of a portion of the second disk, and has a relatively dark color to identify a night-time period. The first disk is movable through the second slot of the second disk.