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
Weakening of the Tribunate of the People
The supreme magistrates of the state were at this period practically the three colleges of the tribunes of the people, the consuls and praetors, and the censors. They all emerged from the Sullan restoration with materially diminished rights, more especially the tribunician office, which appeared to the regent an instrument indispensable doubtless for senatorial government, but yet-- as generated by revolution and having a constant tendency to generate fresh revolutions in its turn--requiring to be rigorously and permanently shackled.
The tribunician authority had arisen out of the right to annul the official acts of the magistrates by veto, and, eventually, to fine any one who should oppose that right and to take steps for his farther punishment; this was still left to the tribunes, excepting that a heavy fine, destroying as a rule a man's civil existence, was imposed on the abuse of the right of intercession.
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Reference address : http://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=29