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
As early as the former year the interrupted distribution of the Carthaginian territory had been resumed primarily for the benefit of the soldiers of Marius--not the burgesses only but, as it would seem, also the Italian allies--and each of these veterans had been promised an allotment of 100 -jugera-, or about five times the size of an ordinary Italian farm, in the province of Africa. Now not only was the provincial land already available claimed in its widest extent for the Romano-Italian emigration, but also all the land of the still independent Celtic tribes beyond the Alps, by virtue of the legal fiction that through the conquest of the Cimbri all the territory occupied by these had been acquired de jure by the Romans.
Gaius Marius was called to conduct the assignations of land and the farther measures that might appear necessary in this behalf; and the temple-treasures of Tolosa, which had been embezzled but were refunded or had still to be refunded by the guilty aristocrats, were destined for the outfit of the new receivers of land. This law therefore not only revived the plans of conquest beyond the Alps and the projects of Transalpine and transmarine colonization, which Gaius Gracchus and Flaccus had sketched, on the most extensive scale; but, by admitting the Italians along with the Romans to emigration and yet undoubtedly prescribing the erection of all the new communities as burgess-colonies, it formed a first step towards satisfying the claims--to which it was so difficult to give effect, and which yet could not be in the long run refused--of the Italians to be placed on an equality with the Romans.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=24