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
Attack on the Transmarine Colonialization - Downfall of Gracchus
Such an opportunity soon occurred. On the 10th of December, 632, Gracchus ceased to be tribune of the people; on the 1st of January, 633, Opimius entered on his office. The first attack, as was fair, was directed against the most useful and the most unpopular measure of Gracchus, the re-establishment of Carthage. While the transmarine colonies had hitherto been only indirectly assailed through the greater allurements of the Italian, African hyaenas, it was now alleged, dug up the newly-placed boundary-stones of Carthage, and the Roman priests, when requested, certified that such signs and portents ought to form an express warning against rebuilding on a site accursed by the gods.
The senate thereby found itself in its conscience compelled to have a law proposed, which prohibited the planting of the colony of Junonia. Gracchus, who with the other men nominated to establish it was just then selecting the colonists, appeared on the day of voting at the Capitol whither the burgesses were convoked, with a view to procure by means of his adherents the rejection of the law. He wished to shun acts of violence, that he might not himself supply his opponents with the pretext which they sought; but he had not been able to prevent a great portion of his faithful partisans, who remembered the catastrophe of Tiberius and were well acquainted with the designs of the aristocracy, from appearing in arms, and amidst the immense excitement on both sides quarrels could hardly be avoided.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=47