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
Any concessions that did take place, came not so much from the pressure of the democracy as from the attempts at mediation of the moderate aristocracy. But of the two laws which the single still surviving leader of this section Gaius Cotta carried in his consulate of 679, that which concerned the tribunals was again set aside in the very next year; and the second, which abolished the Sullan enactment that those who had held the tribunate should be disqualified for undertaking other magistracies, but allowed the other limitations to continue, merely--like every half-measure--excited the displeasure of both parties.
The party of conservatives friendly to reform which lost its most notable head by the early death of Cotta occurring soon after (about 681) dwindled away more and more--crushed between the extremes, which were becoming daily more marked. But of these the party of the government, wretched and remiss as it was, necessarily retained the advantage in presence of the equally wretched and equally remiss opposition.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=6