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 plenitude of the consular power was further restricted in so far as the administration of the military chest was committed to two paymasters (-quaestores-) chosen by the community, who were nominated for the first time in 307. The nomination as well of the two new paymasters for war as of the two administering the city-chest now passed over to the community; the consul retained merely the conduct of the election instead of the election itself. The assembly in which the paymasters were elected was that of the whole patricio-plebeian freeholders, and voted by districts; an arrangement which likewise involved a concession to the plebeian farmers, who had far more command of these assemblies than of the centuriate -comitia-.
A concession of still greater consequence was that which allowed the tribunes to share in the discussions of the senate. To admit the tribunes to the hall where the senate sat, appeared to that body beneath its dignity; so a bench was placed for them at the door that they might from that spot follow its proceedings.
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Reference address : https://www.ellopos.net/elpenor/rome/2-02-tribunate-plebs-decemvirate.asp?pg=38