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
The most remarkable feature was the exclusion of appeal to the -comitia tributa- in capital causes, while the privilege of appeal to the centuries was guaranteed; which admits of explanation from the circumstance that the penal jurisdiction was in fact usurped by the plebs and its presidents,(11) and with the tribunate there necessarily fell the tribunician capital process, while it was perhaps the intention to retain the aedilician process of fine (-multa-).
11. Cf. II. II. Intercession
The essential political significance of the measure resided far less in the contents of the legislation than in the formal obligation now laid upon the consuls to administer justice according to these forms of process and these rules of law, and in the public exhibition of the code, by which the administration of justice was subjected to the control of publicity and the consul was compelled to dispense equal and truly common justice to all.
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Reference address : https://www.ellopos.net/elpenor/rome/2-02-tribunate-plebs-decemvirate.asp?pg=33