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
Just at that time the kingdom and wealth of the Attalids had fallen to the Romans by the testament of the last king of Pergamus;(32) Gracchus proposed to the people that the Pergamene treasure should be distributed among the new landholders for the procuring of the requisite implements and stock, and vindicated generally, in opposition to the existing practice, the right of the burgesses to decide definitively as to the new province.
32. Cf. IV. I. War against Aristonicus
He is said to have prepared farther popular measures, for shortening the period of service, for extending the right of appeal, for abolishing the prerogative of the senators exclusively to do duty as civil jurymen, and even for the admission of the Italian allies to Roman citizenship. How far his projects in reality reached, cannot be ascertained; this alone is certain, that Gracchus saw that his only safety lay in inducing the burgesses to confer on him for a second year the office which protected him, and that, with a view to obtain this unconstitutional prolongation, he held forth a prospect of further reforms. If at first he had risked himself in order to save the commonwealth, he was now obliged to put the commonwealth at stake in order to his own safety.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=45