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
Declaration of War by Rome
The Romans, who had carefully abstained from preventing the war Itself by seasonable interposition, had now what they wished: namely, A serviceable pretext for war--for the Carthaginians had certainly Now transgressed the stipulations of the treaty, that they should not wage war against the allies of Rome or beyond their own bounds(7)-- and an antagonist already beaten beforehand.
7. Cf. III. VI. Peace, III. VII. Carthage
The Italian contingents were already summoned to Rome, and the ships were assembled; the declaration of war might issue at any moment. The Carthaginians made every effort to avert the impending blow. Hasdrubal and Carthalo, the leaders of the patriot party, were condemned to death, and an embassy was sent to Rome to throw the responsibility on them. But at the same time envoys from Utica, the second city of the Libyan Phoenicians, arrived there with full powers to surrender their Community wholly to the Romans--compared with such obliging submissiveness, it seemed almost an insolence that the Carthaginians had rested content with ordering, unbidden, the execution of their most eminent men.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=41