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
Protracted Siege of Athens and the Piraeus - Athens Falls
The sieges in Attica advanced less rapidly. Sulla found himself compelled to prepare all sorts of heavy besieging implements for which the trees of the Academy and the Lyceum had to supply the timber. Archelaus conducted the defence with equal vigour and judgment; he armed the crews of his vessels, and thus reinforced repelled the attacks of the Romans with superior strength and made frequent and not seldom successful sorties.
The Pontic army of Dromichaetes advancing to the relief of the city was defeated under the walls of Athens by the Romans after a severe struggle, in which Sulla's brave legate Lucius Licinius Murena particularly distinguished himself; but the siege did not on that account advance more rapidly. From Macedonia, where the Cappadocians had meanwhile definitively established themselves, plentiful and regular supplies arrived by sea, which Sulla was not in a condition to cut off from the harbour- fortress; in Athens no doubt provisions were beginning to fail, but from the proximity of the two fortresses Archelaus was enabled to make various attempts to throw quantities of grain into Athens, which were not wholly unsuccessful. So the winter of 667-8 passed away tediously without result.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=51