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
Do you not believe, on the contrary, that those people will occupy every spot?" Among the burgesses of the fifth century, who on one day conferred the franchise on all the Sabines, such an orator might perhaps have been hissed; those of the seventh found his reasoning uncommonly clear and the price of the assignation of the Latin domains, which was offered to it by Gracchus, far too low.
The very circumstance, that the senate carried a permission to eject from the city all non- burgesses before the day for the decisive vote, showed the fate in store for the proposal. And when before the voting Livius Drusus, a colleague of Gracchus, interposed his veto against the law, the people received the veto in such a way that Gracchus could not venture to proceed further or even to prepare for Drusus the fate of Marcus Octavius.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=42