Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Influence on the Elections
As to the elections, they passed, so far as they depended on the magistrates and were of political importance, practically into the hands of the senate. In this way it acquired, as has been mentioned already,(25) the right to appoint the dictator.
25. Cf. II. III. Restrictions as to the Accumulation and the Reoccupation of Offices
Great regard had certainly to be shown to the community; the right of bestowing the public magistracies could not be withdrawn from it; but, as has likewise been already observed, care was taken that this election of magistrates should not be constructed into the conferring of definite functions, especially of the posts of supreme command when war was imminent. Moreover the newly introduced idea of special functions on the one hand, and on the other the right practically conceded to the senate of dispensation from the laws, gave to it an important share in official appointments.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=59