An instantaneous date control device for a date display of a timepiece, in particular for a date display of a mechanical wristwatch, the control device comprising: - a date disc, - a gear train forming a kinematic linkage between the control device and a horological movement of said timepiece, - a first mobile, the cam mobile, comprising c a first toothed wheel (3.1) driven by said gear train at a speed of one turn per day, and c a cam (3.2) mounted freely rotatably, over a limited angular range and/or in a single direction of rotation, on the first toothed wheel (3.1) as well as temporarily coupled in rotation to said first toothed wheel (3.1), in a manner such that the cam (3.2) is driven by said first toothed wheel (3.1), because of its rotational freedom over an angular range and/or in a single direction of rotation, in a discontinuous manner at a speed of one turn per day, - a second mobile, the yoke mobile, comprising c a second toothed wheel (4.1) driven via said first toothed wheel (3.1) at a speed of one turn per day, - an unlocking and driving yoke (4.3) carrying c a feeler (4.4) bearing on said cam (3.2) mounted on said first toothed wheel (3.1) and acting as an unlocking finger, and c a driving finger (4.5) which can come into engagement with teeth (1.1) located on the date disc, - an unlocking and driving spring mounted on a frame of the corresponding timepiece and exerting on said unlocking and driving yoke (4.3) a biasing force which is adapted to apply the feeler (4.4) against the cam (3.2) as well as to store sufficient energy to guarantee an instantaneous jump of the date disc, and - a retaining means allowing to secure the angular position of the date disc between two instantaneous jumps, characterized in that the yoke mobile further comprises c a pivot axis (4.2) placed in eccentric manner on said second toothed wheel (4.1), the entirety of said unlocking and driving yoke (4.3) being mounted pivotably about said pivot axis (4.2) on said second toothed wheel (4.1), such that said second toothed wheel (4.1) allows to displace said pivot axis (4.2) of the unlocking and driving yoke (4.3) by rotation in a manner such as to place the driving finger (4.5) of the unlocking and driving yoke (4.3) behind a tooth (1.1) of the date disc just before each instantaneous jump and to place it at the outer periphery of the trajectory of the teeth (1.1) of the date disc after each instantaneous jump. - a date disc, - a gear train forming a kinematic linkage between the control device and a horological movement of said timepiece, - a first mobile, the cam mobile, comprising c a first toothed wheel (3.1) driven by said gear train at a speed of one turn per day, and c a cam (3.2) mounted freely rotatably, over a limited angular range and/or in a single direction of rotation, on the first toothed wheel (3.1) as well as temporarily coupled in rotation to said first toothed wheel (3.1), in a manner such that the cam (3.2) is driven by said first toothed wheel (3.1), because of its rotational freedom over an angular range and/or in a single direction of rotation, in a discontinuous manner at a speed of one turn per day, c a first toothed wheel (3.1) driven by said gear train at a speed of one turn per day, and c a cam (3.2) mounted freely rotatably, over a limited angular range and/or in a single direction of rotation, on the first toothed wheel (3.1) as well as temporarily coupled in rotation to said first toothed wheel (3.1), in a manner such that the cam (3.2) is driven by said first toothed wheel (3.1), because of its rotational freedom over an angular range and/or in a single direction of rotation, in a discontinuous manner at a speed of one turn per day, - a second mobile, the yoke mobile, comprising c a second toothed wheel (4.1) driven via said first toothed wheel (3.1) at a speed of one turn per day, - an unlocking and driving yoke (4.3) carrying c a feeler (4.4) bearing on said cam (3.2) mounted on said first toothed wheel (3.1) and acting as an unlocking finger, and c a driving finger (4.5) which can come into engagement with teeth (1.1) located on the date disc, c a feeler (4.4) bearing on said cam (3.2) mounted on said first toothed wheel (3.1) and acting as an unlocking finger, and c a driving finger (4.5) which can come into engagement with teeth (1.1) located on the date disc, - an unlocking and driving spring mounted on a frame of the corresponding timepiece and exerting on said unlocking and driving yoke (4.3) a biasing force which is adapted to apply the feeler (4.4) against the cam (3.2) as well as to store sufficient energy to guarantee an instantaneous jump of the date disc, and - a retaining means allowing to secure the angular position of the date disc between two instantaneous jumps, characterized in that the yoke mobile further comprises c a pivot axis (4.2) placed in eccentric manner on said second toothed wheel (4.1), the entirety of said unlocking and driving yoke (4.3) being mounted pivotably about said pivot axis (4.2) on said second toothed wheel (4.1), such that said second toothed wheel (4.1) allows to displace said pivot axis (4.2) of the unlocking and driving yoke (4.3) by rotation in a manner such as to place the driving finger (4.5) of the unlocking and driving yoke (4.3) behind a tooth (1.1) of the date disc just before each instantaneous jump and to place it at the outer periphery of the trajectory of the teeth (1.1) of the date disc after each instantaneous jump.