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
Thereupon Metellus left the province, which he had been compelled by decree of the people to give up to his former lieutenant Marius who was now consul; and the latter assumed the supreme command for the next campaign in 648. He was indebted for it in some degree to a revolution. Relying on the services which he had rendered and at the same time on oracles which had been communicated to him, he had resolved to come forward as a candidate for the consulship. If the aristocracy had supported the constitutional, and in other respects quite justifiable, candidature of this able man, who was not at all inclined to take part with the opposition, nothing would have come of the matter but the enrolment of a new family in the consular Fasti.
Instead of this the man of non-noble birth, who aspired to the highest public dignity, was reviled by the whole governing caste as a daring innovator and revolutionist; just as the plebeian candidate had been formerly treated by the patricians, but now without any formal ground in law. The brave officer was sneered at in sharp language by Metellus--Marius was told that he might wait with his candidature till Metellus' son, a beardless boy, could be his colleague--and he was with the worst grace suffered to leave almost at the last moment, that he might appear in the capital as a candidate for the consulship of 647.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=51