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 this sense accordingly the decrees of the senate were issued (29 Sept. 703). The filling up of the Gallic governorships was placed in the order of the day for the 1st March 704; but even now it was attempted to break up the army of Caesar--just as had formerly been done by decree of the people with the army of Lucullus(18)-- by inducing his veterans to apply to the senate for their discharge.
18. Cf. V. II. Mutiny of the Soldiers, V. III. Reappearance of Pompeius
Caesar's supporters effected, indeed, as far as they constitutionally could, the cancelling of these decrees by their tribunician veto; but Pompeius very distinctly declared that the magistrates were bound unconditionally to obey the senate, and that intercessions and similar antiquated formalities would produce no change. The oligarchical party, whose organ Pompeius now made himself, betrayed not obscurely the design, in the event of a victory, of revising the constitution in their sense and removing everything which had even the semblance of popular freedom; as indeed, doubtless for this reason, it omitted to avail itself of the comitia at all in its attacks directed against Caesar. The coalition between Pompeius and the constitutional party was thus formally declared; sentence too was already evidently passed on Caesar, and the term of its promulgation was simply postponed. The elections for the following year proved thoroughly adverse to him.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=40