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
Its Reorganization by Caesar
The reorganization of the Roman military system by Caesar was substantially limited to the tightening and strengthening of the reins of discipline, which had been relaxed under the negligent and incapable supervision previously subsisting. The Roman military system seemed to him neither to need, nor to be capable of, radical reform; he accepted the elements of the army, just as Hannibal had accepted them. The enactment of his municipal ordinance that, in order to the holding of a municipal magistracy or sitting in the municipal council before the thirtieth year, three years' service on horseback--that is, as officer--or six years' service on foot should be required, proves indeed that he wished to attract the better classes to the army; but it proves with equal clearness that amidst the ever-increasing prevalence of an unwarlike spirit in the nation he himself held it no longer possible to associate the holding of an honorary office with the fulfilment of the time of service unconditionally as hitherto.
This very circumstance serves to explain why Caesar made no attempt to re-establish the Roman burgess-cavalry. The levy was better arranged, the time of service was regulated and abridged; otherwise matters remained on the footing that the infantry of the line were raised chiefly from the lower orders of the Roman burgesses, the cavalry and the light infantry from the subjects. That nothing was done for the reorganization of the fleet, is surprising.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=66