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
New Projects of the Conspirators
Meanwhile the development of Oriental affairs grew daily more perilous for the democracy. The settlement of Syria rapidly advanced; already invitations had been addressed to Pompeius from Egypt to march thither and occupy the country for Rome; they could not but be afraid that they would next hear of Pompeius in person having taken possession of the valley of the Nile. It was by this very apprehension probably that the attempt of Caesar to get himself sent by the people to Egypt for the purpose of aiding the king against his rebellious subjects(16) was called forth; it failed, apparently, through the disinclination of great and small to undertake anything whatever against the interest of Pompeius.
16. Cf. V. V. Failure of the First Plans of Conspiracy
His return home, and the probable catastrophe which it involved, were always drawing the nearer; often as the string of the bow had been broken, it was necessary that there should be a fresh attempt to bend it. The city was in sullen ferment; frequent conferences of the heads of the movement indicated that some step was again contemplated.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=24