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
Caesar Governor of the Two Gauls
The most important of these steps was the regulating of the future position of Caesar. Constitutionally it devolved on the senate to fix the functions of the second consular year of office before the election of the consuls took place; accordingly it had, in prospect of the election of Caesar, selected with that view for 696 two provinces in which the governor should find no other employment than the construction of roads and other such works of utility. Of course the matter could not so remain; it was determined among the confederates, that Caesar should obtain by decree of the people an extraordinary command formed on the model of the Gabinio-Manilian laws.
Caesar however had publicly declared that he would introduce no proposal in his own favour; the tribune of the people Publius Vatinius therefore undertook to submit the proposal to the burgesses, who naturally gave their unconditional assent. By this means Caesar obtained the governorship of Cisalpine Gaul and the supreme command of the three legions which were stationed there and were already experienced in border warfare under Lucius Afranius, along with the same rank of propraetor for his adjutants which those of Pompeius had enjoyed; this office was secured to him for five years--a longer period than had ever before been assigned to any general whose appointment was limited to a definite time at all.
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Reference address : https://www.ellopos.net/elpenor/rome/5-06-pompeius-coalition-pretenders.asp?pg=28