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
Varro and the more sagacious men in general evidently gave up the task of annals as hopeless; at the most they arranged, as did Titus Pomponius Atticus, the official and gentile lists in unpretending tabular shape--a work by which the synchronistic Graeco-Roman chronology was finally brought into the shape in which it was conventionally fixed for posterity. But the manufacture of city-chronicles of course did not suspend its activity; it continued to supply its contributions both in prose and verse to the great library written by ennui for ennui, while the makers of the books, in part already freedmen, did not trouble themselves at all about research properly so called.
Such of these writings as are mentioned to us--not one of them is preserved--seem to have been not only of a wholly secondary character, but in great part even pervaded by interested falsification. It is true that the chronicle of Quintus Claudius Quadrigarius (about 676?) was written in an old-fashioned but good style, and studied at least a commendable brevity in the representation of the fabulous period. Gaius Licinius Macer (d. as late praetor in 688), father of the poet Calvus,(30) and a zealous democrat, laid claim more than any other chronicler to documentary research and criticism, but his -libri lintei- and other matters peculiar to him are in the highest degree suspicious, and an interpolation of the whole annals in the interest of democratic tendencies-- an interpolation of a very extensive kind, and which has passed over in part to the later annalists--is probably traceable to him.
30. Cf. V. XII. Catullus
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Reference address : https://www.ellopos.net/elpenor/rome/5-12-religion-culture-literature-art.asp?pg=70