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
δεῖ τοιγαροῦν οὐκ ἐπιπλήττειν τὸν συγγραφέα τερατευόμενον διὰ τῆς ἱστορίας τοὺς ἐντυγχάνοντας
Political and Social Distinctions in Rome
The strict conception of the unity and omnipotence of the state in all matters pertaining to it, which was the central principle of the Italian constitutions, placed in the hands of the single president nominated for life a formidable power, which was felt doubtless by the enemies of the land, but was not less heavily felt by its citizens. Abuse and oppression could not fail to ensue, and, as a necessary consequence, efforts were made to lessen that power.
It was, however, the grand distinction of the endeavours after reform and the revolutions in Rome, that there was no attempt either to impose limitations on the community as such or even to deprive it of corresponding organs of expression--that there never was any endeavour to assert the so-called natural rights of the individual in contradistinction to the community--that, on the contrary, the attack was wholly directed against the form in which the community was represented.
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Reference address : https://www.ellopos.net/elpenor/rome/2-01-constitution-magistrate.asp