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
Lastly, as the number of praetors to be nominated yearly was raised from six to eight, the new arrangement of the duties was such, that the ten chief magistrates to be nominated yearly devoted themselves, during their first year of office, as consuls or praetors to the business of the capital--the two consuls to government and administration, two of the praetors to the administration of civil law, the remaining six to the reorganized administration of criminal justice--and, during their second year of office, were as proconsuls or propraetors invested with the command in one of the ten governorships: Sicily, Sardinia, the two Spains, Macedonia, Asia, Africa, Narbo, Cilicia, and Italian Gaul. The already-mentioned augmentation of the number of quaestors by Sulla to twenty was likewise connected with this arrangement.(28)
28. As two quaestors were sent to Sicily, and one to each of the other provinces, and as moreover the two urban quaestors, the two attached to the consuls in conducting war, and the four quaestors of the fleet continued to subsist, nineteen magistrates were annually required for this office. The department of the twentieth quaestor cannot be ascertained.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=38