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
Moreover, the towns laid out by Rome in the interior of Italy began towards the close of this period to receive instead of Latin rights the full franchise, which previously had only been given to the maritime colonies; and the enlargement of the Latin body by the accession of new communities, which hitherto had gone on so regularly, thus came to an end.
Aquileia, the establishment of which began in 571, was the latest of the Italian colonies of Rome that received Latin rights; the full franchise was given to the colonies, sent forth nearly at the same time, of Potentia, Pisaurum, Mutina, Parma, and Luna (570-577). The reason for this evidently lay in the decline of the Latin as compared with the Roman franchise.
The colonists conducted to the new settlements were always, and now more than ever, chosen in preponderating number from the Roman burgesses; and even among the poorer portion of these there was a lack of people willing, for the sake even of acquiring considerable material advantages, to exchange their rights as burgesses for those of the Latin franchise.
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=34