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 Cut Off from Italy
But the further course of the campaign did not correspond to this brilliant beginning. Bibulus subsequently made up in some measure for the negligence, of which he had allowed himself to be guilty, by redoubling his exertions. He not only captured nearly thirty of the transports returning home, and caused them with every living thing on board to be burnt, but he also established along the whole district of coast occupied by Caesar, from the island Sason (Saseno) as far as the ports of Corcyra, a most careful watch, however troublesome it was rendered by the inclement season of the year and the necessity of bringing everything necessary for the guard-ships, even wood and water, from Corcyra; in fact his successor Libo--for he himself soon succumbed to the unwonted fatigues--even blockaded for a time the port of Brundisium, till the want of water again dislodged him from the little island in front of it on which he had established himself.
It was not possible for Caesar's officers to convey the second portion of the army over to their general. As little did he himself succeed in the capture of Dyrrhachium. Pompeius learned through one of Caesar's peace envoys as to his preparations for the voyage to the Epirot coast, and, thereupon accelerating his march, threw himself just at the right time into that important arsenal. The situation of Caesar was critical. Although he extended his range in Epirus as far as with his slight strength was at all possible, the subsistence of his army remained difficult and precarious, while the enemy, in possession of the magazines of Dyrrhachium and masters of the sea, had abundance of everything.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=68