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
Resumption of the Conspiracy
For a moment the conspiracy came to a standstill. The elections for 690 took place without Crassus and Caesar renewing their attempt to get possession of the consulate; which may have been partly owing to the fact that a relative of the leader of the democracy, Lucius Caesar, a weak man who was not unfrequently employed by his kinsman as a tool, was on this occasion a candidate for the consulship. But the reports from Asia urged them to make haste. The affairs of Asia Minor and Armenia were already completely arranged. However clearly democratic strategists showed that the Mithradatic war could only be regarded as terminated by the capture of the king, and that it was therefore necessary to undertake the pursuit round the Black Sea, and above all things to keep aloof from Syria(11)--Pompeius, not concerning himself about such talk, had set out in the spring of 690 from Armenia and marched towards Syria.
11. Cf. V. IV. Pompeius Proceeds to Colchis
If Egypt was really selected as the headquarters of the democracy, there was no time to be lost; otherwise Pompeius might easily arrive in Egypt sooner than Caesar. The conspiracy of 688, far from being broken up by the lax and timid measures of repression, was again astir when the consular elections for 691 approached. The persons were, it may be presumed, substantially the same, and the plan was but little altered. The leaders of the movement again kept in the background. On this occasion they had set up as candidates for the consulship Catilina himself and Gaius Antonius, the younger son of the orator and a brother of the general who had an ill repute from Crete.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=20