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 exclusive circles of the nobility, to whom this change in the personal composition of the senate naturally gave the bitterest offence, saw in it an intentional depreciation of the very institution itself. Caesar was not capable of such a self-destructive policy; he was as determined not to let himself be governed by his council as he was convinced of the necessity of the institute in itself.
They might more correctly have discerned in this proceeding the intention of the monarch to take away from the senate its former character of an exclusive representation of the oligarchic aristocracy, and to make it once more--what it had been in the regal period-- a state-council representing all classes of persons belonging to the state through their most intelligent elements, and not necessarily excluding the man of humble birth or even the foreigner; just as those earliest kings introduced non-burgesses,(24) Caesar introduced non-Italians into his senate.
24. Cf. I. V. The Senate as State-Council, II. I. Senate
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=47