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
He Solicits Re-election to the Tribunate
The tribes met to elect the tribunes for the ensuing year, and the first divisions gave their votes for Gracchus; but the opposite party in the end prevailed with their veto, so far at least that the assembly broke up without having accomplished its object, and the decision was postponed to the following day.
For this day Gracchus put in motion all means legitimate and illegitimate; he appeared to the people dressed in mourning, and commended to them his youthful son; anticipating that the election would once more be disturbed by the veto, he made provision for expelling the adherents of the aristocracy by force from the place of assembly in front of the Capitoline temple.
So the second day of election came on; the votes fell as on the preceding day, and again the veto was exercised; the tumult began. The burgesses dispersed; the elective assembly was practically dissolved; the Capitoline temple was closed; it was rumoured in the city, now that Tiberius had deposed all the tribunes, now that he had resolved to continue his magistracy without reelection.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=46