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
With joy the Italians heard that Drusus had carried his first proposals with the consent of the great majority of the senate; with still greater joy all the communities of Italy celebrated not long afterwards the recovery of the tribune, who had been suddenly attacked by severe illness.
But as the further designs of Drusus became unveiled, a change took place; he could not venture to bring in his chief law; he had to postpone, he had to delay, he had soon to retire. It was reported that the majority of the senate were vacillating and threatened to fall away from their leader; in rapid succession the tidings ran through the communities of Italy, that the law which had passed was annulled, that the capitalists ruled more absolutely than ever, that the tribune had been struck by the hand of an assassin, that he was dead (autumn of 663).
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=12