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
In a similar way the decision in civil procedure was withdrawn from the supreme magistracy, inasmuch as the right of the king to transfer an individual process for decision to a deputy was converted into the duty of the consul, after settling the legitimate title of the party and the object of the suit, to refer the disposal of it to a private man to be selected by him and furnished by him with instructions.
In like manner there was left to the consuls the important administration of the state-treasure and of the state-archives; nevertheless probably at once, or at least very early, there were associated with them standing assistants in that duty, namely, those quaestors who, doubtless, had in exercising this function absolutely to obey them, but without whose previous knowledge and co-operation the consuls could not act.
Where on the other hand such directions were not in existence, the president of the community in the capital had personally to intervene; as indeed, for example, at the introductory steps of a process he could not under any circumstances let himself be represented by deputy.
This double restriction of the consular right of delegation subsisted for the government of the city, and primarily for the administration of justice and of the state-chest. As commander-in-chief, on the other hand, the consul retained the right of handing over all or any of the duties devolving on him. This diversity in the treatment of civil and military delegation explains why in the government of the Roman community proper no delegated magisterial authority (-pro magistrate-) was possible, nor were purely urban magistrates ever represented by non-magistrates; and why, on the other hand, military deputies (-pro consuls-, -pro praetore-, -pro quaestore-) were excluded from all action within the community proper.
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Reference address : https://www.ellopos.net/elpenor/rome/2-01-constitution-magistrate.asp?pg=14