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
Better Arrangement of Business - Increase of the Power of the Senate
By this plan, in the first instance, a clear and fixed rule was substituted for the irregular mode of distributing offices hitherto adopted, a mode which invited all manner of vile manoeuvres and intrigues; and, secondly, the excesses of magisterial authority were as far as possible obviated and the influence of the supreme governing board was materially increased. According to the previous arrangement the only legal distinction in the empire was that drawn between the city which was surrounded by the ring-wall, and the country beyond the -pomerium-; the new arrangement substituted for the city the new Italy henceforth, as in perpetual peace, withdrawn from the regular -imperium-,(29) and placed in contrast to it the continental and transmarine territories, which were, on the other hand, necessarily placed under military commandants--the provinces as they were henceforth called.
29. The Italian confederacy was much older (Cf. II. VII. Italy and the Italians); but it was a league of states, not, like the Sullan Italy, a state-domain marked off as an unit within the Roman empire.
According to the former arrangement the same man had very frequently remained two, and often more years in the same office. The new arrangement restricted the magistracies of the capital as well as the governorships throughout to one year; and the special enactment that every governor should without fail leave his province within thirty days after his successor's arrival there, shows very clearly--particularly if we take along with it the formerly-mentioned prohibition of the immediate re-election of the late magistrate to the same or another public office--what the tendency of these arrangements was.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=39