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
Death of Gracchus
The senate assembled in the temple of Fidelity, close by the temple of Jupiter; the bitterest opponents of Gracchus spoke in the sitting; when Tiberius moved his hand towards his forehead to signify to the people, amidst the wild tumult, that his head was in danger, it was said that he was already summoning the people to adorn his brow with the regal chaplet. The consul Scaevola was urged to have the traitor put to death at once. When that temperate man, by no means averse to reform in itself, indignantly refused the equally irrational and barbarous request, the consular Publius Scipio Nasica, a harsh and vehement aristocrat, summoned those who shared his views to arm themselves as they could and to follow him.
Almost none of the country people had come into town for the elections; the people of the city timidly gave way, when they saw men of quality rushing along with fury in their eyes, and legs of chairs and clubs in their hands. Gracchus attempted with a few attendants to escape. But in his flight he fell on the slope of the Capitol, and was killed by a blow on the temples from the bludgeon of one of his furious pursuers --Publius Satureius and Lucius Rufus afterwards contested the infamous honour--before the statues of the seven kings at the temple of Fidelity; with him three hundred others were slain, not one by weapons of iron.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=47