A date mechanism comprising: - a driving wheel (100, 300), - a months wheel (106, 306) kinematically connected by a first kinematic link to the driving wheel so as to be driven at a rate of 1/31 revolution per day by said driving wheel, said months wheel carrying or driving a date display mechanism, - a year wheel (116, 312) kinematically connected to the months wheel by a second kinematic link and arranged to be driven at a rate of 1/12 revolutions per month by the second kinematic link and optionally by an additional kinematic link, said year wheel including: o a duration of the months level, provided with elements whereof a determined dimension varies based on the duration of the months with which said elements are respectively associated, said duration of the months level including driving elements that participate in retransmitting, to the months wheel, an additional correction movement at the end of months with fewer than 31 days, said retransmission depending on the dimension of said elements, such that said months wheel (106, 306) is driven, on the last day of a month, by 1/31 revolution for a month with 31 days, by 2/31 revolutions for a month with 30 days and 4/31 revolutions for a month with 28 days, characterized in that it further comprises: - a days level divided into twelve sectors, each comprising 0, 2 or 3 drive elements for the months comprising 28, 30 or 31 days, respectively, intended to be kinematically connected to an organ for displaying the day of the week so as to drive it at a rate of 3 steps at the end of months with 31 days, 2 steps at the end of months with 30 days and 0 steps at the end of months with 28 days, said year wheel (116, 312) carrying or driving a month display organ (22, 222) and further being kinematically connected by a third kinematic link to a year display organ (28, 30; 226). - a driving wheel (100, 300), - a months wheel (106, 306) kinematically connected by a first kinematic link to the driving wheel so as to be driven at a rate of 1/31 revolution per day by said driving wheel, said months wheel carrying or driving a date display mechanism, - a year wheel (116, 312) kinematically connected to the months wheel by a second kinematic link and arranged to be driven at a rate of 1/12 revolutions per month by the second kinematic link and optionally by an additional kinematic link, said year wheel including: o a duration of the months level, provided with elements whereof a determined dimension varies based on the duration of the months with which said elements are respectively associated, said duration of the months level including driving elements that participate in retransmitting, to the months wheel, an additional correction movement at the end of months with fewer than 31 days, said retransmission depending on the dimension of said elements, such that said months wheel (106, 306) is driven, on the last day of a month, by 1/31 revolution for a month with 31 days, by 2/31 revolutions for a month with 30 days and 4/31 revolutions for a month with 28 days, characterized in that it further comprises: - a days level divided into twelve sectors, each comprising 0, 2 or 3 drive elements for the months comprising 28, 30 or 31 days, respectively, intended to be kinematically connected to an organ for displaying the day of the week so as to drive it at a rate of 3 steps at the end of months with 31 days, 2 steps at the end of months with 30 days and 0 steps at the end of months with 28 days, said year wheel (116, 312) carrying or driving a month display organ (22, 222) and further being kinematically connected by a third kinematic link to a year display organ (28, 30; 226). o a duration of the months level, provided with elements whereof a determined dimension varies based on the duration of the months with which said elements are respectively associated, said duration of the months level including driving elements that participate in retransmitting, to the months wheel, an additional correction movement at the end of months with fewer than 31 days, said retransmission depending on the dimension of said elements, such that said months wheel (106, 306) is driven, on the last day of a month, by 1/31 revolution for a month with 31 days, by 2/31 revolutions for a month with 30 days and 4/31 revolutions for a month with 28 days, - a days level divided into twelve sectors, each comprising 0, 2 or 3 drive elements for the months comprising 28, 30 or 31 days, respectively, intended to be kinematically connected to an organ for displaying the day of the week so as to drive it at a rate of 3 steps at the end of months with 31 days, 2 steps at the end of months with 30 days and 0 steps at the end of months with 28 days,