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
At nearly the same period were composed the Greek "Histories" of Quintus Fabius Pictor(56) (after 553), a man of noble family who took an active part in state affairs during the Hannibalic war, and of Publius Scipio, the son of Scipio Africanus (about 590).
56. That this oldest prose work on the history of Rome was composed in Greek, is established beyond a doubt by Dionys. i. 6, and Cicero, de Div. i. 21, 43. The Latin Annals quoted under the same name by Quintilian and later grammarians remain involved in mystery, and the difficulty is increased by the circumstance, that there is also quoted under the same name a very detailed exposition of the pontifical law in the Latin language. But the latter treatise will not be attributed by any one, who has traced the development of Roman literature in its connection, to an author of the age of the Hannibalic war; and even Latin annals from that age appear problematical, although it must remain a moot question whether there has been a confusion of the earlier with a later annalist, Quintus Fabius Maximus Servilianus (consul in 612), or whether there existed an old Latin edition of the Greek Annals of Fabius as well as of those of Acilius and Albinus, or whether there were two annalists of the name of Fabius Pictor.
The historical work likewise written in Greek, ascribed to Lucius Cincius Alimentus a contemporary of Fabius, seems spurious and a compilation of the Augustan age.
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Reference address : https://www.ellopos.net/elpenor/rome/3-14-literature-art.asp?pg=86