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
As soon as the season allowed, Sulla threw himself with vehemence on the Piraeus; he in fact succeeded by missiles and mines in making a breach in part of the strong walls of Pericles, and immediately the Romans advanced to the assault; but it was repulsed, and on its being renewed crescent-shaped entrenchments were found constructed behind the fallen walls, from which the invaders found themselves assailed on three sides with missiles and compelled to retire. Sulla then raised the siege, and contented himself with a blockade.
In the meanwhile the provisions in Athens were wholly exhausted; the garrison attempted to procure a capitulation, but Sulla sent back their fluent envoys with the hint that he stood before them not as a student but as a general, and would accept only unconditional surrender. When Aristion, well knowing what fate was in store for him, delayed compliance, the ladders were applied and the city, hardly any longer defended, was taken by storm (1 March 668).
Aristion threw himself into the Acropolis, where he soon afterwards surrendered. The Roman general left the soldiery to murder and plunder in the captured city and the more considerable ringleaders of the revolt to be executed; but the city itself obtained back from him its liberty and its possessions-- even the important Delos,--and was thus once more saved by its illustrious dead.
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Reference address : https://www.ellopos.net/elpenor/rome/4-08-east-king-mithradates.asp?pg=52