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
Further Plans of Gracchus
The aristocracy made no secret that, while they would acquiesce perhaps in the law because they could not do otherwise, the officious legislator should never escape their vengeance; and the announcement of Quintus Pompeius, that he would impeach Gracchus on the very day of his resigning his tribunate, was far from being the worst of the threats thrown out against the tribune. Gracchus believed, probably with reason, that his personal safety was imperilled, and no longer appeared in the Forum without a retinue of 3000 or 4000 men--a step which drew down on him bitter expressions in the senate, even from Metellus who was not averse to reform in itself.
Altogether, if he had expected to reach the goal by the carrying of his agrarian law, he had now to learn that he was only at the starting-point. The "people" owed him gratitude; but he was a lost man, if he had no farther protection than this gratitude of the people, if he did not continue indispensable to them and did not constantly attach to himself fresh interests and hopes by means of other and more comprehensive proposals.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=44