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 Social Distress, and the Attempt to Relieve It
Nevertheless one object of the compromise concluded by the two portions of the plebs in 387, the abolition of the patriciate, had in all material points been completely attained. The question next arises, how far the same can be affirmed of the two positive objects aimed at in the compromise?--whether the new order of things in reality checked social distress and established political equality?
The two were intimately connected; for, if economic embarrassments ruined the middle class and broke up the burgesses into a minority of rich men and a suffering proletariate, such a state of things would at once annihilate civil equality and in reality destroy the republican commonwealth. The preservation and increase of the middle class, and in particular of the farmers, formed therefore for every patriotic statesman of Rome a problem not merely important, but the most important of all.
The plebeians, moreover, recently called to take part in the government, greatly indebted as they were for their new political rights to the proletariate which was suffering and expecting help at their hands, were politically and morally under special obligation to attempt its relief by means of government measures, so far as relief was by such means at all attainable.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=26