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
Rupture between Rome and Carthage
Hannibal resolved immediately after his nomination (in the spring of 534) to commence the war. The land of the Celts was still in a ferment, and a war seemed imminent between Rome and Macedonia: he had good reason now to throw off the mask without delay and to carry the war whithersoever he pleased, before the Romans began it at their own convenience with a descent on Africa.
His army was soon ready to take the field, and his exchequer was filled by some razzias on a great scale; but the Carthaginian government showed itself far from desirous of despatching the declaration of war to Rome. The place of Hasdrubal, the patriotic national leader, was even more difficult to fill in Carthage than that of Hasdrubal the general in Spain; the peace party had now the ascendency at home, and persecuted the leaders of the war party with political indictments.
The rulers who had already cut down and mutilated the plans of Hamilcar were by no means inclined to allow the unknown young man, who now commanded in Spain, to vent his youthful patriotism at the expense of the state; and Hannibal hesitated personally to declare war in open opposition to the legitimate authorities.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=25