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
While a gold mine was thus opened for the mercantile class, and the members of the new partnership constituted a great financial power imposing even for the government--a "senate of merchants"-a definite sphere of public action was at the same time assigned to them in the jury courts. The field of the criminal procedure, which by right came before the burgesses, was among the Romans from the first very narrow, and was, as we have already stated,(22) still further narrowed by Gracchus; most processes--both such as related to public crimes, and civil causes--were decided either by single jurymen [-indices-], or by commissions partly permanent, partly extraordinary.
22. Cf. IV. III. Modifications of the Penal Law
Hitherto both the former and the latter had been exclusively taken from the senate; Gracchus transferred the functions of jurymen--both in strictly civil processes, and in the case of the standing and temporary commissions-- to the equestrian order, directing a new list of jurymen to be annually formed after the analogy of the equestrian centuries from all persons of equestrian rating, and excluding the senators directly, and the young men of senatorial families by the fixing of a certain limit of age, from such judicial functions.(23)
23. We still possess a great portion of the new judicial ordinance-- primarily occasioned by this alteration in the personnel of the judges-- for the standing commission regarding extortion; it is known under the name of the Servilian, or rather Acilian, law -de repetundis-.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=29