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
But the senate might very well sacrifice the Latin and even the Campanian domains as well as Sicily in order to raise the Italian farmer class, and yet retain the government as before; to which fell to be added the consideration, that they could not more effectually obviate future agitations than by providing that all the land at all disposable should be brought to distribution by the aristocracy itself, and that according to Drusus' own expression, nothing should be left for future demagogues to distribute but "the street-dirt and the daylight."
In like manner it was for the government--whether that might be a monarch, or a close number of ruling families--very much a matter of indifference whether the half or the whole of Italy possessed the Roman franchise; and hence the reforming men on both sides probably could not but coincide in the idea of averting the danger of a recurrence of the insurrection of Fregellae on a larger scale by a judicious and reasonable extension of the franchise, and of seeking allies, moreover, for their plans in the numerous and influential Italians.
Sharply as in the question of the headship of the state the views and designs of the two great political parties differed, the best men of both camps had many points of contact in their means of operation and in their reforming tendencies; and, as Scipio Aemilianus may be named alike among the adversaries of Tiberius Gracchus and among the promoters of his reforming efforts, so Drusus was the successor and disciple no less than the antagonist of Gaius. The two high-born and high-minded youthful reformers had a greater resemblance than was apparent at the first glance; and, personally also, the two were not unworthy to meet, as respects the substance of their patriotic endeavours, in purer and higher views above the obscuring mists of prejudiced partisanship.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=47