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
Thus Italy at that time ended practically at the Po, while the Transpadane country was treated as an outlying dependency. Here to the north of the Po, with the exception of Cremona, Eporedia and Aquileia, there were no burgess or Latin colonies, and even the native tribes here had been by no means dislodged as they were to the south of the Po. The abolition of the Celtic cantonal, and the introduction of the Italian urban, constitution paved the way for the Romanizing of the rich and important territory; this was the first step in the long and momentous transformation of the Gallic stock-- which once stood contrasted with Italy, and the assaults of which Italy had rallied to repel--into comrades of their Italian masters.
Considerable as these concessions were, if we compare them with the rigid exclusiveness which the Roman burgess-body had retained for more than a hundred and fifty years, they were far from involving a capitulation with the actual insurgents; they were on the contrary intended partly to retain the communities that were wavering and threatening to revolt, partly to draw over as many deserters as possible from the ranks of the enemy. To what extent these laws and especially the most important of them--that of Caesar--were applied, cannot be accurately stated, as we are only able to specify in general terms the extent of the insurrection at the time when the law was issued.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=40