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 republicans soon descended from heaven to earth. The law as to the domain of Capua and the other laws issued by Caesar as consul had been constantly described by them as null and void, and an opinion had been expressed in the senate as early as Dec. 697 that it was necessary to cancel them on account of their informalities. On the 6th April 698 the consular Cicero proposed in a full senate to put the consideration of the Campanian land distribution in the order of the day for the 15th May. It was the formal declaration of war; and it was the more significant, that it came from the mouth of one of those men who only show their colours when they think that they can do so with safety.
Evidently the aristocracy held that the moment had come for beginning the struggle not with Pompeius against Caesar, but against the -tyrannis- generally. What would further follow might easily be seen. Domitius made no secret that he intended as consul to propose to the burgesses the immediate recall of Caesar from Gaul. An aristocratic restoration was at work; and with the attack on the colony of Capua the nobility threw down the gauntlet to the regents.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=23