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
The Dependent States
But wherever the eye might turn throughout the wide sphere of Roman administration, the same causes and the same effects appeared. If the Sicilian slave-war showed how far the government was from being equal to even its simplest task of keeping in check the proletariate, contemporary events in Africa displayed the skill with which the Romans now governed the client-states.
About the very time when the Sicilian slave-war broke out, there was exhibited before the eyes of the astonished world the spectacle of an unimportant client-prince able to carry out a fourteen years' usurpation and insurrection against the mighty republic which had shattered the kingdoms of Macedonia and Asia with one blow of its weighty arm-- and that not by means of arms, but through the pitiful character of its rulers.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=25