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
It was evident that the senate did not appoint the expedition, but merely allowed it: Scipio did not obtain half the resources which had formerly been placed at the command of Regulus, and he got that very corps which for years had been subjected by the senate to intentional degradation. The African army was, in the view of the majority of the senate, a forlorn hope of disrated companies and volunteers, the loss of whom in any event the state had no great occasion to regret.
Any one else than Scipio would perhaps have declared that the African expedition must either be undertaken with other means, or not at all; but Scipio's confidence accepted the terms, whatever they were, solely with the view of attaining the eagerly-coveted command. He carefully avoided, as far as possible, the imposition of direct burdens on the people, that he might not injure the popularity of the expedition. Its expenses, particularly those of building the fleet which were considerable, were partly procured by what was termed a voluntary contribution of the Etruscan cities--that is, by a war tribute imposed as a punishment on the Arretines and other communities disposed to favour the Phoenicians--partly laid upon the cities of Sicily.
In forty days the fleet was ready for sea. The crews were reinforced by volunteers, of whom seven thousand from all parts of Italy responded to the call of the beloved officer. So Scipio set sail for Africa in the spring of 550 with two strong legions of veterans (about 30,000 men), 40 vessels of war, and 400 transports, and landed successfully, without meeting the slightest resistance, at the Fair Promontory in the neighbourhood of Utica.
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Reference address : https://www.ellopos.net/elpenor/rome/3-06-war-hannibal-cannae-zama.asp?pg=81