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 new empire needed immediately an institution which should place before the government at a glance the principal bases of administration--the proportions of population and property in the different communities-- in other words an improved census. First the census of Italy was reformed. According to Caesar's ordinance(101)--which probably, indeed, only carried out the arrangements which were, at least as to principle, adopted in consequence of the Social war-- in future, when a census took place in the Roman community, there were to be simultaneously registered by the highest authority in each Italian community the name of every municipal burgess and that of his father or manumitter, his district, his age, and his property; and these lists were to be furnished to the Roman censor early enough to enable him to complete in proper time the general list of Roman burgesses and of Roman property.
101. The continued subsistence of the municipal census-authorities speaks for the view, that the local holding of the census had already been established for Italy in consequence of the Social war (Staatsrecht, ii. 8 368); but probably the carrying out of this system was Caesar's work.
That it was Caesar's intention to introduce similar institutions also in the provinces is attested partly by the measurement and survey of the whole empire ordered by him, partly by the nature of the arrangement itself; for it in fact furnished the general instrument appropriate for procuring, as well in the Italian as in the non-Italian communities of the state, the information requisite for the central administration.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=166