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
The plan was not the most refined. The attempt at rivalry was too clear; the endeavour to draw the fair bond between the nobles and the proletariate still closer by their exercising jointly a tyranny over the Latins was too transparent; the inquiry suggested itself too readily, In what part of the peninsula, now that the Italian domains had been mainly given away already--even granting that the whole domains assigned to the Latins were confiscated--was the occupied domain-land requisite for the formation of twelve new, numerous, and compact burgess-communities to be discovered?
Lastly the declaration of Drusus, that he would have nothing to do with the execution of his law, was so dreadfully prudent as to border on sheer folly. But the clumsy snare was quite suited for the stupid game which they wished to catch. There was the additional and perhaps decisive consideration, that Gracchus, on whose personal influence everything depended, was just then establishing the Carthaginian colony in Africa, and that his lieutenant in the capital, Marcus Flaccus, played into the hands of his opponents by his vehement and maladroit actings.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=45