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 the Administration of the Capital
Lastly, so far as concerns the administration of the city which was his capital and residence, the Imperator evidently intended for a time to entrust this also to magistrates similarly nominated by him. He revived the old city-lieutenancy of the regal period;(27) on different occasions he committed during his absence the administration of the capital to one or more such lieutenants nominated by him without consulting the people and for an indefinite period, who united in themselves the functions of all the administrative magistrates and possessed even the right of coining money with their own name, although of course not with their own effigy.
27. Cf. I. V. The King
In 707 and in the first nine months of 709 there were, moreover, neither praetors nor curule aediles nor quaestors; the consuls too were nominated in the former year only towards its close, and in the latter Caesar was even consul without a colleague. This looks altogether like an attempt to revive completely the old regal authority within the city of Rome, as far as the limits enjoined by the democratic past of the new monarch; in other words, of magistrates additional to the king himself, to allow only the prefect of the city during the king's absence and the tribunes and plebeian aediles appointed for protecting popular freedom to continue in existence, and to abolish the consulship, the censorship, the praetorship, the curule aedileship and the quaestorship.(28)
28. Hence accordingly the cautious turns of expression on the mention of these magistracies in Caesar's laws; -cum censor aliusve quis magistratus Romae populi censum aget (L. Jul. mun. l. 144); praetor isve quei Romae iure deicundo praerit (L. Rubr. often); quaestor urbanus queive aerario praerit- (L. Jul. mun. l. 37 et al.).
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=53