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 Sicilians had in this way long paid their tenth either to Syracuse or to Carthage, and had been wont to levy customs-dues no longer on their own account. "We received," says Cicero, "the Sicilian communities into our clientship and protection in such a way that they continued under the same law under which they had lived before, and obeyed the Roman community under relations similar to those in which they had obeyed their own rulers."
It is fair that this should not be forgotten; but to continue an injustice is to commit injustice. Viewed in relation not to the subjects, who merely changed masters, but to their new rulers, the abandonment of the equally wise and magnanimous principle of Roman statesmanship--viz., that Rome should accept from her subjects simply military aid, and never pecuniary compensation in lieu of it--was of a fatal importance, in comparison with which all alleviations in the rates and the mode of levying them, as well as all exceptions in detail, were as nothing.
Such exceptions were, no doubt, made in various cases. Messana was directly admitted to the confederacy of the -togati-, and, like the Greek cities in Italy, furnished its contingent to the Roman fleet. A number of other cities, while not admitted to the Italian military confederacy, yet received in addition to other favours immunity from tribute and tenths, so that their position in a financial point of view was even more favourable than that of the Italian communities.
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Reference address : http://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=14