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
Pompeius obtained neither free control over the treasury, nor legions and ships of his own, nor even an authority superior to that of the governors; but they contented themselves with granting to him, for the purpose of his organizing due supplies for the capital, considerable sums, fifteen adjutants, and in allaffairs elating to the supply of grain full proconsular power throughout the Roman dominions for the next five years, and with having this decree confirmed by the burgesses.
There were many different reasons which led to this alteration, almost equivalent to a rejection, of the original plan: a regard to Caesar, with reference to whom the most timid could not but have the greatest scruples in investing his colleague not merely with equal but with superior authority in Gaul itself; the concealed opposition of Pompeius' hereditary enemy and reluctant ally Crassus, to whom Pompeius himself attributed or professed to attribute primarily the failure of his plan; the antipathy of the republican opposition in the senate to any decree which really or nominally enlarged the authority of the regents; lastly and mainly, the incapacity of Pompeius himself, who even after having been compelled to act could not prevail on himself to acknowledge his own action, but chose always to bring forward his real design as it were in incognito by means of his friends, while he himself in his well-known modesty declared his willingness to be content with even less. No wonder that they took him at his word, and gave him the less.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=20