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
For instance, he prevented by his veto one of his colleagues from cancelling through a decree of the people the sentences of jurymen issued under the Varian law; and when the late aedile Gaius Caesar, passing over the praetorship, unconstitutionally became a candidate for the consulship for 667, with the design, it was alleged, of getting the charge of the Asiatic war afterwards entrusted to him, Sulpicius opposed him more resolutely and sharply than any one else.
Entirely in the spirit of Drusus, he thus demanded from himself as from others primarily and especially the maintenance of the constitution. But in fact he was as little able as was Drusus to reconcile things that were incompatible, and to carry out in strict form of law the change of the constitution which he had in view--a change judicious in itself, but never to be obtained from the great majority of the old burgesses by amicable means.
His breach with the powerful family of the Julii--among whom in particular the consular Lucius Caesar, the brother of Gaius, was very influential in the senate-- and withthesectionof the aristocracy adhering to it, beyond doubt materially cooperated and carried the irascible man through personal exasperation beyond his original design.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=60