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
It is true that it required some interval--though but short--to render these soldiers available; but the arrangements for this purpose as well as for the carrying out of the new levies ordered by the senate in consequence of the outbreak of the civil war were already everywhere in progress. Immediately after the decisive decree of the senate (7 Jan. 705), in the very depth of winter the most eminent men of the aristocracy set out to the different districts, to hasten the calling up of recruits and the preparation of arms.
The want of cavalry was much felt, as for this arm they had been accustomed to rely wholly on the provinces and especially on the Celtic contingents; to make at least a beginning, three hundred gladiators belonging to Caesar were taken from the fencing-schools of Capua and mounted--a step which however met with so general disapproval, that Pompeius again broke up this troop and levied in room of it 300 horsemen from the mounted slave-herdmen of Apulia.
The state-treasury was at a low ebb as usual; they busied themselves in supplementing the inadequate amount of cash out of the local treasuries and even from the temple-treasures of the -municipia-.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=17