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
Rival Demagogism of the Senate - The Livian Laws
As a matter of course, the senate offered to the proletariate not merely the same advantages as Gracchus had already assured to it in corn and otherwise, but advantages still greater. Commissioned by the senate, the tribune of the people Marcus Livius Drusus proposed to relieve those who received land under the laws of Gracchus from the rent imposed on them,(27) and to declare their allotments to be free and alienable property; and, further, to provide for the proletariate not in transmarine, but in twelve Italian, colonies, each of 3000 colonists, for the planting of which the people might nominate suitable men; only, Drusus himself declined--in contrast with the family-complexion of the Gracchan commission--to take part in this honourable duty.
27. Cf. IV. II. Tribunate of Gracchus
Presumably the Latins were named as those who would have to bear the costs of the plan, for there does not appear to have now existed in Italy other occupied domain-land of any extent save that which was enjoyed by them. We find isolated enactments of Drusus-- such as the regulation that the punishment of scourging might only be inflicted on the Latin soldier by the Latin officer set over him, and not by the Roman officer--which were to all appearance intended to indemnify the Latins for other losses.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=44