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
Dissatisfaction in the Capital
This was too much to be borne. While the Africans were exulting and the prospect--thus suddenly opened up--of such an overthrow of the alien domination as had been reckoned scarcely possible was bringing numerous tribes of the free and half-free inhabitants of the desert to the standards of the victorious king, public opinion in Italy was vehemently aroused against the equally corrupt and pernicious governing aristocracy, and broke out in a storm of prosecutions which, fostered by the exasperation of the mercantile class, swept away a succession of victims from the highest circles of the nobility.
On the proposal of the tribune of the people Gaius Mamilius Limetanus, in spite of the timid attempts of the senate to avert the threatened punishment, an extraordinary jury-commission was appointed to investigate the high treason that had occurred in connection with the question of the Numidian succession; and its sentences sent the two former commanders- in-chief Gaius Bestia and Spurius Albinus as well as Lucius Opimius, the head of the first African commission and the executioner withal of Gaius Gracchus, along with numerous other less notable men of the government party, guilty and innocent, into exile.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=39