A device for driving a date mobile (3) of a horological calendar mechanism, the device comprising: a driving mobile (2) including a first finger (20a) and a second finger (20b); a programming mobile (1) including a first set of teeth (10a), a second set of teeth (10b) and a third set of teeth (10c); and the date mobile (3) including a fourth set of teeth (30a) and a fifth set of teeth (30b), the first finger cooperating with the first set of teeth, the second finger cooperating with the second set of teeth, the first set of teeth cooperating with the fourth set of teeth and the third set of teeth cooperating with the fifth set of teeth.