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
Dictatorship of Pompeius
But the instigators of these scandalous scenes had overacted their part. Certainly their lord and master was resolved to employ this favourable episode in order not merely to set aside Milo, but also to seize the dictatorship; he wished, however, to receive it not from a mob of bludgeon-men, but from the senate. Pompeius brought up troops to put down the anarchy which prevailed in the capital, and which had in reality become intolerable to everybody; at the same time he now enjoined what he had hitherto requested, and the senate complied.
It was merely an empty subterfuge, that on the proposal of Cato and Bibulus the proconsul Pompeius, retaining his former offices, was nominated as "consul without colleague" instead of dictator on the 25th of the intercalary month(12) (702)--a subterfuge, which admitted an appellation labouring under a double incongruity(13) for the mere purpose of avoiding one which expressed the simple fact, and which vividly reminds us of the sagacious resolution of the waning patriciate to concede to the plebeians not the consulship, but only the consular power.(14)
12. In this year the January with 29 and the February with 23 days were followed by the intercalary month with 28, and then by March.
13. -Consul- signifies "colleague" (i. 318), and a consul who is at the same time proconsul is at once an actual consul and a consul's substitute.
14. Cf. II. III. Military Tribunes with Consular Powers
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=52