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
Far more serious disapproval in every respect is due to the idea of dragging an independent neighbouring state into the Roman civil war and of bringing about by its means a counter-revolution; law and conscience condemn the deserter more severely than the robber, and a victorious band of robbers finds its way back to a free and well-ordered commonwealth more easily than the emigrants who are conducted back by the public foe. Besides it was scarcely probable that the beaten party would be able to effect a restoration in this way. The only state, from which they could attempt to seek support, was that of the Parthians; and as to this it was at least doubtful whether it would make their cause its own, and very improbable that it would fight out that cause against Caesar.
The time for republican conspiracies had not yet come.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=95