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
Conference of the Regents at Luca
Caesar, although receiving from day to day detailed accounts of the events in the capital and, whenever military considerations allowed, watching their progress from as near a point of his southern province as possible, had not hitherto, visibly at least interfered in them. But now war had been declared against him as well as his colleague, in fact against him especially; he was compelled to act, and he acted quickly. He happened to be in the very neighbourhood; the aristocracy had not even found it advisable to delay the rupture, till he should have again crossed the Alps. In the beginning of April 698 Crassus left the capital, to concert the necessary measures with his more powerful colleague; he found Caesar in Ravenna.
Thence both proceeded to Luca, and there they were joined by Pompeius, who had departed from Rome soon after Crassus (11 April), ostensibly for the purpose of procuring supplies of grain from Sardinia and Africa. The most noted adherents of the regents, such as Metellus Nepos the proconsul of Hither Spain, Appius Claudius the propraetor of Sardinia, and many others, followed them; a hundred and twenty lictors, and upwards of two hundred senators were counted at this conference, where already the new monarchical senate was represented in contradistinction to the republican.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=24