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
They had become sufficiently convinced of the incorrigibleness of the party in power: the fact that the governing lords had even in the last war neither forgotten their spite nor learned greater wisdom, was shown by the effrontery bordering on simplicity with which they now instituted proceedings against Hamilcar as the originator of the mercenary war, because he had without full powers from the government made promises of money to his Sicilian soldiers.
Had the club of officers and popular leaders desired to overthrow this rotten and wretched government, it would hardly have encountered much difficulty in Carthage itself; but it would have met with more formidable obstacles in Rome, with which the chiefs of the government in Carthage already maintained relations that bordered on treason.
To all the other difficulties of the position there fell to be added the circumstance, that the means of saving their country had to be created without allowing either the Romans, or their own government with its Roman leanings, to become rightly aware of what was doing.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=7