The present invention provides a device (1) for actuating a date star (2) of a perpetual calendar mechanism comprising a large rocker (4) arranged to be able to cooperate with a month cam (6) as well as for actuate the date star (2) each day, said large lever (4) being capable of pivoting according to a travel of variable amplitude according to the months between a first initial actuation position defined by one of the positions of the large rocker (4) when in contact with the month cam (6), and a final actuation position. The actuation device comprises a mechanism for limiting the stroke of the large rocker (4) between a second initial actuation position and the final actuation position, said second initial actuation position being intermediate between the first initial position actuation and the final actuation position, said limiting mechanism comprising a locking device (24) of the large rocker (4) movable between a locked position in which the large rocker (4) is locked in its pivoting to limit its stroke between its second initial actuation position and its final actuation position and an unlocked position in which the large lever (4) is free to pivot between its first initial actuation position and its final actuation position, and a locking cam (20) cooperating with said locking device (24) and arranged to define the days for which the locking device (24) is in the locked position or in the unlocked position, the locking device (24) being in the unlocked position at least on the last day of a month of less than 31 days when a catch-up of the days at the end of the month is necessary.
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