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
To this was added a stricter administration of criminal justice and an energetic police. The laws, especially as regards the crime of violence, were rendered more stringent; and the irrational enactment of the republican law, that the convicted criminal was entitled to withdraw himself from a part of the penalty which he had incurred by self-banishment, was with reason set aside.
The detailed regulations, which Caesar issued regarding the police of the capital, are in great part still preserved; and all who choose may convince themselves that the Imperator did not disdain to insist on the house-proprietors putting the streets into repair and paving the footpath in its whole breadth with hewn stones, and to issue appropriate enactments regarding the carrying of litters and the driving of waggons, which from the nature of the streets were only allowed to move freely through the capital in the evening and by night.
The supervision of the local police remained as hitherto chiefly with the four aediles, who were instructed now at least, if not earlier, each to superintend a distinctly marked-off police district within the capital.
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Reference address : http://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=93