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 Good Understanding between the Regents Relaxed
After Caesar had, at the conference of Luca in April 698, agreed to considerable concessions as regarded Pompeius, and the regents had thus placed themselves substantially on a level, their relation was not without the outward conditions of durability, so far as a division of the monarchical power--in itself indivisible-- could be lasting at all. It was a different question whether the regents, at least for the present, were determined to keep together and mutually to acknowledge without reserve their title to rank as equals. That this was the case with Caesar, in so far as he had acquired the interval necessary for the conquest of Gaul at the price of equalization with Pompeius, has been already set forth.
But Pompeius was hardly ever, even provisionally, in earnest with the collegiate scheme. His was one of those petty and mean natures, towards which it is dangerous to practise magnanimity; to his paltry spirit it appeared certainly a dictate of prudence to supplant at the first opportunity his reluctantly acknowledged rival, and his mean soul thirsted after a possibility of retaliating on Caesar for the humiliation which he had suffered through Caesar's indulgence. But while it is probable that Pompeius in accordance with his dull and sluggish nature never properly consented to let Caesar hold a position of equality by his side, yet the design of breaking up the alliance doubtless came only by degrees to be distinctly entertained by him.
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Reference address : http://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=19