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
Opposition of the Patriciate
But notwithstanding these vexatious disabilities the privileges of the clans, so far as they had a political value, were legally superseded by the new institution; and, had the Roman nobility been worthy of its name, it must now have given up the struggle. But it did not.
Though a rational and legal resistance was thenceforth impossible, spiteful opposition still found a wide field of petty expedients, of chicanery and intrigue; and, far from honourable or politically prudent as such resistance was, it was still in a certain sense fruitful of results.
It certainly procured at length for the commons concessions which could not easily have been wrung from the united Roman aristocracy; but it also prolonged civil war for another century and enabled the nobility, in defiance of those laws, practically to retain the government in their exclusive possession for several generations longer.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=6