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
In like manner the Carthaginians already at the end of the second century of Rome established themselves in Sardinia, which was utilized by them precisely in the same way as Libya.
While the natives withdrew into the mountainous interior of the island to escape from bondage as agricultural serfs, just as the Numidians in Africa withdrew to the borders of the desert, Phoenician colonies were conducted to Caralis (Cagliari) and other important points, and the fertile districts along the coast were turned to account by the introduction of Libyan cultivators.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=20