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
By the care of his father he had been early initiated into that genuine Greek culture, which elevated him above the insipid Hellenizing of the semi-culture commonly in vogue; by his earnest and apt appreciation of the good and bad qualities in the Greek character, and by his aristocratic carriage, this Roman made an impression on the courts of the east and even on the scoffing Alexandrians. His Hellenism was especially recognizable in the delicate irony of his discourse and in the classic purity of his Latin.
Although not strictly an author, he yet, like Cato, committed to writing his political speeches--they were, like the letters of his adopted sister the mother of the Gracchi, esteemed by the later -litteratores- as masterpieces of model prose--and took pleasure in surrounding himself with the better Greek and Roman -litterati-, a plebeian society which was doubtless regarded with no small suspicion by those colleagues in the senate whose noble birth was their sole distinction. A man morally steadfast and trustworthy, his word held good with friend and foe; he avoided buildings and speculations, and lived with simplicity; while in money matters he acted not merely honourably and disinterestedly, but also with a tenderness and liberality which seemed singular to the mercantile spirit of his contemporaries.
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Reference address : https://www.ellopos.net/elpenor/rome/4-02-reform-tiberius-gracchus.asp?pg=31