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
A similar indication of the rising importance of urban life in Rome is presented by the great development of the urban police. To this period probably belong in great measure the enactments under which the four aediles divided the city into four police districts, and made provision for the discharge of their equally important and difficult functions--for the efficient repair of the network of drains small and large by which Rome was pervaded, as well as of the public buildings and places; for the proper cleansing and paving of the streets; for obviating the nuisances of ruinous buildings, dangerous animals, or foul smells; for the removing of waggons from the highway except during the hours of evening and night, and generally for the keeping open of the communication; for the uninterrupted supply of the market of the capital with good and cheap grain; for the destruction of unwholesome articles, and the suppression of false weights and measures; and for the special oversight of baths, taverns, and houses of bad fame.
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Reference address : https://www.ellopos.net/elpenor/rome/2-08-law-religion-army-economy-nationality.asp?pg=36