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 only to be expected that, as the -tyrannis- had rested for its support against the oligarchy, so the latter should rest for its support against the moneyed aristocracy, on the paid and in some degree organized proletariate; while the government had formerly accepted the feeding of the proletariate at the expense of the state as an inevitable evil, Drusus now thought of employing it, at least for the moment, against the moneyed aristocracy.
It was only to be expected that the better part of the aristocracy, just as it formerly consented to the agrarian law of Tiberius Gracchus, would now readily consent to all those measures of reform, which, without touching the question of a supreme head, only aimed at the cure of the old evils of the state. In the question of emigration and colonization, it is true, they could not go so far as the democracy, since the power of the oligarchy mainly rested on their free control over the provinces and was endangered by any permanent military command; the ideas of equalizing Italy and the provinces and of making conquests beyond the Alps were not compatible with conservative principles.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=46