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
To these fell to be added the colonies instituted by Rome and the Latin league; Ardea in the former territory of the Rutuli, and Satricum, Velitrae, Norba, Signia, Setia and Circeii in that of the Volsci. Besides, seventeen other townships, whose names are not known with certainty, had the privilege of participating in the Latin festival without the right of voting.
On this footing--of forty-seven townships entitled to participate and thirty entitled to vote--the Latin confederacy continued henceforward unalterably fixed. The Latin communities founded subsequently, such as Sutrium, Nepete,(16) Antium, Tarracina,(17) and Gales, were not admitted into the confederacy, nor were the Latin communities subsequently divested of their autonomy, such as Tusculum and Lanuvium, erased from the list.
16. Cf. II. IV. South Etruria Roman
17. Cf. II. V. League with the Hernici
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Reference address : https://www.ellopos.net/elpenor/rome/2-05-subjugation-latins-campanians.asp?pg=18