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
In Egypt, after the death of Ptolemaeus Auletes (May 703) his children, Cleopatra about sixteen years of age and Ptolemaeus Dionysus about ten, had ascended the throne according to their father's will jointly, and as consorts; but soon the brother or rather his guardian Pothinus had driven the sister from the kingdom and compelled her to seek a refuge in Syria, whence she made preparations to get back to her paternal kingdom. Ptolemaeus and Pothinus lay with the whole Egyptian army at Pelusium for the sake of protecting the eastern frontier against her, just when Pompeius cast anchor at the Casian promontory and sent a request to the king to allow him to land.
The Egyptian court, long informed of the disaster at Pharsalus, was on the point of refusing to receive Pompeius; but the king's tutor Theodotus pointed out that, in that case Pompeius would probably employ his connections in the Egyptian army to instigate rebellion; and that it would be safer, and also preferable with regard to Caesar, if they embraced the opportunity of making away with Pompeius. Political reasonings of this sort did not readily fail of their effect among the statesmen of the Greek world.
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Reference address : https://www.ellopos.net/elpenor/rome/5-10-brundisium-pharsalus-thapsus.asp?pg=97