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 New Government
The termination of the struggles between the old and new burgesses, the various and comparatively successful endeavours to relieve the middle class, and the germs--already making their appearance amidst the newly acquired civic equality--of the formation of a new aristocratic and a new democratic party, have thus been passed in review.
It remains that we describe the shape which the new government assumed amidst these changes, and the positions in which after the political abolition of the nobility the three elements of the republican commonwealth--the burgesses, the magistrates, and the senate--stood towards each other.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=38