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
Such were the ordinances, by which Caesar attempted to reform the Italian national economy. It is easy both to show their insufficiency, seeing that they allowed a multitude of evils still to exist, and to prove that they operated in various respects injuriously by imposing restrictions, some of which were very severely felt, on freedom of dealing. It is still easier to show that the evils of the Italian national economy generally were incurable.
But in spite of this the practical statesman will admire the work as well as the master-workman. It was already no small achievement that, where a man like Sulla, despairing of remedy, had contented himself with a mere formal reorganization, the evil was seized in its proper seat and grappled with there; and we may well conclude that Caesar with his reforms came as near to the measure of what was possible as it was given to a statesman and a Roman to come. He could not and did not expect from them the regeneration of Italy; but he sought on the contrary to attain this in a very different way, for the right apprehension of which it is necessary first of all to review the condition of the provinces as Caesar found them.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=135