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
He tried to provoke the Saguntines to break the peace; but they contented themselves with making a complaint to Rome. Then, when a commission from Rome appeared, he tried to drive it to a declaration of war by treating it rudely; but the commissioners saw how matters stood: they kept silence in Spain, with a view to lodge complaints at Carthage and to report at home that Hannibal was ready to strike and that war was imminent.
Thus the time passed away; accounts had already come of the death of Antigonus Doson, who had suddenly died nearly at the same time with Hasdrubal; in Cisalpine Gaul the establishment of fortresses was carried on by the Romans with redoubled rapidity and energy; preparations were made in Rome for putting a speedy end in the course of the next spring to the insurrection in Illyria.
Every day was precious; Hannibal formed his resolution. He sent summary intimation to Carthage that the Saguntines were making aggressions on the Torboletes, subjects of Carthage, and he must therefore attack them; and without waiting for a reply he began in the spring of 535 the siege of a town which was in alliance with Rome, or, in other words, war against Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/3-04-hamilcar-hannibal.asp?pg=26