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
Marcius Enters Macedonia through the Pass of Tempe - The Armies on the Elpius
The third commander-in-chief also, whom Rome sent to Macedonia in 585, Quintus Marcius Philippus, that already-mentioned upright guest-friend of the king, was not at all equal to his far from easy task. He was ambitious and enterprising, but a bad officer. His hazardous venture of crossing Olympus by the pass of Lapathus westward of Tempe, leaving behind one division to face the garrison of the pass, and making his way with his main force through impracticable denies to Heracleum, is not excused by the fact of its success.
Not only might a handful of resolute men have blocked the route, in which case retreat was out of the question; but even after the passage, when he stood with the Macedonian main force in front and the strongly-fortified mountain- fortresses of Tempe and Lapathus behind him, wedged into a narrow plain on the shore and without supplies or the possibility of foraging for them, his position was no less desperate than when, in his first consulate, he had allowed himself to be similarly surrounded in the Ligurian defiles which thenceforth bore his name.
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Reference address : http://www.ellopos.net/elpenor/rome/3-10-third-macedonian-war.asp?pg=27