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
But the reaction did not immediately attack the distributions of grain, the taxation of the province of Asia, or the Gracchan arrangement as to the jurymen and courts; on the contrary, it not only spared the mercantile class and the proletariate of the capital, but continued to render homage, as it had already done in the introduction of the Livian laws, to these powers and especially to the proletariate far more decidedly than had been done by the Gracchi.
This course was not adopted merely because the Gracchan revolution still thrilled for long the minds of its contemporaries and protected its creations; the fostering and cherishing at least of the interests of the populace was in fact perfectly compatible with the personal advantage of the aristocracy, and thereby nothing further was sacrificed than merely the public weal.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=4