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
Rome no longer possessed a fleet of her own; she was content to make requisitions for ships, when it seemed necessary, from the maritime towns of Italy, Asia Minor, and elsewhere. The consequence naturally was, that buccaneering became organized and consolidated. Something, perhaps, though not enough, was done towards its suppression, so far as the direct power of the Romans extended, in the Adriatic and Tyrrhene seas. The expeditions directed against the Dalmatian and Ligurian coasts at this epoch aimed especially at the suppression of piracy in the two Italian seas; for the same reason the Balearic islands were occupied in 631.(41)
41. Cf. IV. I. New Organization of Spain
But in the Mauretanian and Greek waters the inhabitants along the coast and the mariners were left to settle matters with the corsairs in one way or another, as they best could; for Roman policy adhered to the principle of troubling itself as little as possible about these more remote regions. The disorganized and bankrupt commonwealths in the states along the coast thus left to themselves naturally became places of refuge for the corsairs; and there was no want of such, especially in Asia.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=113