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
Gaius Gracchus (601-633) was very different from his brother, who was about nine years older. Like the latter, he had no relish for vulgar pleasures and vulgar pursuits; he was a man of thorough culture and a brave soldier; he had served with distinction before Numantia under his brother-in-law, and afterwards in Sardinia. But in talent, in character, and above all in passion he was decidedly superior to Tiberius. The clearness and self-possession, which the young man afterwards displayed amidst the pressure of all the varied labours requisite for the practical carrying out of his numerous laws, betokened his genuine statesmanly talent; as the passionate devotedness faithful even to death, with which his intimate friends clung to him, evinced the loveable nature of that noble mind.
The discipline of suffering which he had undergone, and his compulsory reserve during the last nine years, augmented his energy of purpose and action; the indignation repressed within the depths of his breast only glowed there with an intensified fervour against the party which had disorganized his country and murdered his brother. By virtue of this fearful vehemence of temperament he became the foremost orator that Rome ever had; without it, we should probably have been able to reckon him among the first statesmen of all times.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=14