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
The League of the Achaean Cities
Of all the Greek settlements, that which retained most thoroughly its distinctive character and was least affected by influences from without was the settlement which gave birth to the league of the Achaean cities, composed of the towns of Siris, Pandosia, Metabus or Metapontum, Sybaris with its offsets Posidonia and Laus, Croton, Caulonia, Temesa, Terina, and Pyxus.
These colonists, taken as a whole, belonged to a Greek stock which steadfastly adhered to its own peculiar dialect, having closest affinity with the Doric, and for long retained no less steadfastly the old national Greek mode of writing, instead of adopting the more recent alphabet which had elsewhere come into general use; and which preserved its own nationality, as distinguished alike from the barbarians and from other Greeks, by the firm bond of a federal constitution.
The language of Polybius regarding the Achaean symmachy in the Peloponnesus may be applied also to these Italian Achaeans; "Not only did they live in federal and friendly communion, but they made use of like laws, like weights, measures, and coins, as well as of the same magistrates, councillors, and judges."
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Reference address : https://www.ellopos.net/elpenor/rome/1-10-greeks-italy-tuscans-carthaginians.asp?pg=11