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
In general however the consideration had weight with Caesar, that the soldiers of Rome should not, like those of Oriental kings, be commanded by lackeys. It remained the rule to entrust the more important governorships to those who had been consuls, the less important to those who had been praetors; and once more, instead of the five years' interval prescribed by the law of 702,(26) the commencement of the governorship probably was in the ancient fashion annexed directly to the close of the official functions in the city.
26. Cf. V. VIII. Changes in the Arrangement of Magistracies and the Jury-System
On the other hand the distribution of the provinces among the qualified candidates, which had hitherto been arranged sometimes by decree of the people or senate, sometimes by concert among the magistrates or by lot, passed over to the monarch. And, as the consuls were frequently induced to abdicate before the end of the year and to make room for after- elected consuls (-consules suffecti-); as, moreover, the number of praetors annually nominated was raised from eight to sixteen, and the nomination of half of them was entrusted to the Imperator in the same way as that of the half of the quaestors; and, lastly, as there was reserved to the Imperator the right of nominating, if not titular consuls, at any rate titular praetors and titular quaestors: Caesar secured a sufficient number of candidates acceptable to him for filling up the governorships. Their recall remained of course left to the discretion of the regent as well as their nomination; as a rule it was assumed that the consular governor should not remain more than two years, nor the praetorian more than one year, in the province.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=52