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
Beyond doubt these colonies were also designed to aid in permanently defending the revolution to which they owed their existence. Still more significant and momentous was the measure, by which Gaius Gracchus first proceeded to provide for the Italian proletariate in the transmarine territories of the state.
He despatched to the site on which Carthage had stood 6000 colonists selected perhaps not merely from Roman burgesses but also from the Italian allies, and conferred on the new town Junonia the rights of a Roman burgess-colony. The foundation was important, but still more important was the principle of transmarine emigration thereby laid down.
It opened up for the Italian proletariate a permanent outlet, and a relief in fact more than provisional; but it certainly abandoned the principle of state-law hitherto in force, by which Italy was regarded as exclusively the governing, and the provincial territory as exclusively the governed, land.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=20