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
So they left the constitution untouched, and the chiefs of the government in full enjoyment of their exclusive privileges and of the public property. It was merely proposed and carried, that of the two commanders-in-chief, who at the end of the Libyan war were at the head of the Carthaginian troops, Hanno and Hamilcar, the former should be recalled, and the latter should be nominated commander-in-chief for all Africa during an indefinite period. It was arranged that he should hold a position independent of the governing corporations --his antagonists called it an unconstitutional monarchical power, Cato calls it a dictatorship--and that he could only be recalled and placed upon his trial by the popular assembly.(2)
2. The Barca family conclude the most important state treaties, and the ratification of the governing board is a formality (Pol. iii. 21). Rome enters her protest before them and before the senate (Pol. iii. 15). The position of the Barca family towards Carthage in many points resembles that of the Princes of Orange towards the States-General.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=8