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
Already formal treaties were concluded with the Boii and the Insubres, by which they bound themselves to send guides to meet the Carthaginian army, to procure for it a good reception from the cognate tribes and supplies along its route, and to rise against the Romans as soon as it should set foot on Italian ground. In fine, the relations of Rome with the east led the Carthaginians to this same quarter.
Macedonia, which by the victory of Sellasia had re-established its sovereignty in the Peloponnesus, was in strained relations with Rome; Demetrius of Pharos, who had exchanged the Roman alliance for that of Macedonia and had been dispossessed by the Romans, lived as an exile at the Macedonian court, and the latter had refused the demand which the Romans made for his surrender.
If it was possible to combine the armies from the Guadalquivir and the Karasu anywhere against the common foe, it could only be done on the Po. Thus everything directed Hannibal to Northern Italy; and that the eyes of his father had already been turned to that quarter, is shown by the reconnoitring party of Carthaginians, whom the Romans to their great surprise encountered in Liguria in 524.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=32