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
Finally as regards administration, war, peace and alliances, the founding of colonies, the assignation of lands, building, in fact every matter of permanent and general importance, and in particular the whole system of finance, depended absolutely on the senate. It was the senate which annually issued general instructions to the magistrates, settling their spheres of duty and limiting the troops and moneys to be placed at the disposal of each; and recourse was had to its counsel in every case of importance.
The keepers of the state-chest could make no payment to any magistrate with the exception of the consul, or to any private person, unless authorized by a previous decree of the senate. In the management, however, of current affairs and in the details of judicial and military administration the supreme governing corporation did not interfere; the Roman aristocracy had too much political judgment and tact to desire to convert the control of the commonwealth into a guardianship over the individual official, or to turn the instrument into a machine.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=61