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
Lastly, there adhered to Rome the allied communities of best legal position--in Campania Nola and Nuceria and the Greek maritime towns Neapolis and Rhegium, and in like manner at least most of the Latin colonies, such as Alba and Aesernia--just as in the Hannibalic war the Latin and Greek towns on the whole had taken part with, and the Sabellian towns against, Rome. The forefathers of the city had based their dominion over Italy on an aristocratic classification, and with skilful adjustment of the degrees of dependence had kept in subjection the less privileged communities by means of those with better rights, and the burgesses within each community by means of the municipal aristocracy.
It was only now, under the incomparably wretched government of the oligarchy, that the solidity and strength with which the statesmen of the fourth and fifth centuries had joined together the stones of their structure were thoroughly put to the test; the building, though shaken in various ways, still held out against this storm. When we say, however, that the towns of better position did not at the first shock abandon Rome, we by no means affirm that they would now, as in the Hannibalic war, hold out for a length of time and after severe defeats, without wavering in their allegiance to Rome; that fiery trial had not yet been endured.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=18