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
The Old Party Names and the Pretenders
But however Pompeius might delay, the crisis was incessantly urged on by the mere force of circumstances.
The impending war was not a struggle possibly between republic and monarchy--for that had been virtually decided years before-- but a struggle between Pompeius and Caesar for the possession of the crown of Rome. But neither of the pretenders found his account in uttering the plain truth; he would have thereby driven all that very respectable portion of the burgesses, which desired the continuance of the republic and believed in its possibility, directly into the camp of his opponent. The old battle-cries raised by Gracchus and Drusus, Cinna and Sulla, used up and meaningless as they were, remained still good enough for watchwords in the struggle of the two generals contending for the sole rule; and, though for the moment both Pompeius and Caesar ranked themselves officially with the so-called popular party, it could not be for a moment doubtful that Caesar would inscribe on his banner the people and democratic progress, Pompeius the aristocracy and the legitimate constitution.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=24