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
Lastly the fleet of Pompeius was very considerable. It was formed partly of the Roman transports brought from Brundisium or subsequently built, partly of the war vessels of the king of Egypt, of the Colchian princes, of the Cilician dynast Tarcondimotus, of the cities of Tyre, Rhodes, Athens, Corcyra, and generally of all the Asiatic and Greek maritime states; and it numbered nearly 500 sail, of which the Roman vessels formed a fifth. Immense magazines of corn and military stores were accumulated in Dyrrhachium. The war-chest was well filled, for the Pompeians found themselves in possession of the principal sources of the public revenue and turned to their own account the moneyed resources of the client- princes, of the senators of distinction, of the farmers of the taxes, and generally of the whole Roman and non-Roman population within their reach.
Every appliance that the reputation of the legitimate government and the much-renowned protectorship of Pompeius over kings and peoples could move in Africa, Egypt, Macedonia, Greece, Western Asia and Syria, had been put in motion for the protection of the Roman republic; the report which circulated in Italy that Pompeius was arming the Getae, Colchians, and Armenians against Rome, and the designation of "king of kings" given to Pompeius in the camp, could hardly be called exaggerations. On the whole he had command over an army of 7000 cavalry and eleven legions, of which it is true, but five at the most could be described as accustomed to war, and over a fleet of 500 sail.
The temper of the soldiers, for whose provisioning and pay Pompeius manifested adequate care, and to whom in the event of victory the most abundant rewards were promised, was throughout good, in several-- and these precisely the most efficient--divisions even excellent but a great part of the army consisted of newly-raised troops, the formation and training of which, however zealously it was prosecuted, necessarily required time. The force altogether was imposing, but at the same time of a somewhat motley character.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=64