A timepiece includes a date indicator with inner teeth moving angularly by one step per day. An indication control star meshes with the inner teeth of the indicator. A pinion that is integral and coaxial with the star drives an indicator wheel on which an indication arbor is centrally disposed. The rotary indicating structure is driven by the date indicator through the indication arbor and is intended to indicate cyclic parameters such as the date, the phase of the moon, the user's "cash balance," etc. Various types of indication, all controlled by the date indicator, make it possible to produce a wide range of watches of simple design with different display combinations.

A calendar watch includes a central date indicator (4). The indicator is united with a crown wheel (9) comprising teeth (11) forming a circular crown (12) arranged to be perpendicular to a face (13) of said wheel. The teeth (12) are driven by a finger (14) rotating in a plane intersecting said crown in its height. The finger is united with a date driving wheel (15). The invention permits easy transformation of a watch having its date display in a dial aperture to a watch having a date indicator rotating about the center of the movement.

This chronograph-watch includes, superposed over one another and in the following order, a motor module (19), a chronograph module (27) and a dial (12). The motor module comprises a first date ring (17). The chronograph module includes a second date ring (28) located immediately under the dial and bearing indications (14) concerning the date which appear through an opening (13). The second ring (28) is controlled by the first ring (17), through a drive chain (32, 33, 34, 36) assembled in the chronograph module.