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 Valerio-Horatian Laws
The compromise, as was natural, proved very favourable to the plebeians, and again imposed severely felt restrictions on the power of the nobility. As a matter of course the tribunate of the people was restored, the code of law wrung from the aristocracy was definitively retained, and the consuls were obliged to judge according to it.
Through the code indeed the tribes lost their usurped jurisdiction in capital causes; but the tribunes got it back, as a way was found by which it was possible for them to transact business as to such cases with the centuries. Besides they retained, in the right to award fines without limitation and to submit this sentence to the -comitia tributa-, a sufficient means of putting an end to the civic existence of a patrician opponent.
Further, it was on the proposition of the consuls decreed by the centuries that in future every magistrate--and therefore the dictator among the rest--should be bound at his nomination to allow the right of appeal: any one who should nominate a magistrate on other terms was to expiate the offence with his life. In other respects the dictator retained his former powers; and in particular his official acts could not, like those of the consuls, be cancelled by a tribune.
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Reference address : https://www.ellopos.net/elpenor/rome/2-02-tribunate-plebs-decemvirate.asp?pg=37