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
Leading Schools - Newer Academy - Epicurus and Zeno
Besides the historico-rationalistic conception of religion, which resolved the myths into biographies of various benefactors of the human race living in the grey dawn of early times whom superstition had transformed into gods, or Euhemerism as it was called,(8) there were chiefly three philosophical schools that came to be of importance for Italy; viz. the two dogmatic schools of Epicurus (484) and Zeno (491) and the sceptical school of Arcesilaus (513) and Carneades (541-625), or, to use the school-names, Epicureanism, the Stoa, and the newer Academy.
8. Cf. III. XIII. Irreligious Spirit
The last of these schools, which started from the impossibility of assured knowledge and in its stead conceded as possible only a provisional opinion sufficient for practical needs, presented mainly a polemical aspect, seeing that it caught every proposition of positive faith or of philosophic dogmatism in the meshes of its dilemmas. So far it stands nearly on a parallel with the older method of the sophists; except that, as may be conceived, the sophists made war more against the popular faith, Carneades and his disciples more against their philosophical colleagues.
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Reference address : http://www.ellopos.net/elpenor/rome/4-12-nationality-religion-education.asp?pg=13