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 the future also the mode of admission to the senate was regulated anew and placed on an essentially different basis. As the constitution had hitherto stood, men entered the senate either through the summons of the censors, which was the proper and ordinary way, or through the holding of one of the three curule magistracies--the consulship, the praetorship, or the aedileship-- to which since the passing of the Ovinian law a seat and vote in the senate had been de jure attached.(14)
14. Cf. III. XI. The Nobility in Possession of the Senate
The holding of an inferior magistracy, of the tribunate or the quaestorship, gave doubtless a claim de facto to a place in the senate--inasmuch as the censorial selection especially turned towards the men who had held such offices--but by no means a reversion de jure.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=22