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
Meanwhile Gaius Gracchus reappeared in Rome. The aristocracy had first sought to detain the object of their dread in Sardinia by omitting to provide the usual relief, and then, when without caring for that point he returned, had brought him to trial as one of the authors of the Fregellan revolt (629-30).
But the burgesses acquitted him; and now he too threw down the gauntlet, became a candidate for the tribuneship of the people, and was nominated to that office for the year 631 in an elective assembly attended by unusual numbers. War was thus declared.
The democratic party, always poor in leaders of ability, had from sheer necessity remained virtually at rest for nine years; now the truce was at an end, and this time it was headed by a man who, with more honesty than Carbo and with more talent than Flaccus, was in every respect called to take the lead.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=13