Abstract: A digital day/night display device includes an hour disc provided with ciphers 1-12 representing the hours, and made such that light can pass either through the ciphers or through parts of the hours disc surrounding these ciphers; a rotative day/night disc located under the hours disc including a first zone and a second zone of different colors or shadings; and a mechanism for driving in rotation the hours disc and the day/night disc. The zones extend under the ciphers of the hours disc. Also provided are elements for driving the hours disc in a continuous way and at a constant speed at the rate of two revolutions in twenty-four hours and other elements for driving in a continuous way but intermittently the day/night disc at a rate of one revolution in twenty-four hours. A time piece provided with this digital day/night display device is also described.

Abstract: A chronograph with a chronograph driving mechanism through which a chronograph hand staff of a chronograph hand can be driven in rotation, with a rattrapante hand staff, arranged coaxially to the chronograph hand staff, of a first rattrapante hand that can be driven in superimposed position with the chronograph hand. The chronograph hand staff and rattrapante hand staff are connected to one another in locked-rotation, wherein the rotation of the rattrapante hand staff can be blocked in order to display a split time. A second rattrapante hand is connected frictionally with a second rattrapante hand staff arranged coaxially to the chronograph hand staff. The chronograph hand and the second rattrapante hand can be driven in movement synchronously in superimposed position, wherein the rotation of both rattrapante hand staffs can be blocked independently from one another in order to display two different lap times.