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
This settlement of the commonwealth was acceptable to no party, and had to be imposed on his associates no less than on his opponents. Caesar's own position was now in a certain sense more imperilled than before the victory; but what he lost, the state gained. By annihilating the parties and not simply sparing the partisans but allowing every man of talent or even merely of good descent to attain to office irrespective of his political past, he gained for his great building all the working power extant in the state; and not only so, but the voluntary or compulsory participation of men of all parties in the same work led the nation also over imperceptibly to the newly prepared ground.
The fact that this reconciliation of the parties was for the moment only externaland that they were for the present much less agreed in adherence to the new state of things than in hatred against Caesar, did not mislead him; he knew well that antagonisms lose their keenness when brought into such outward union, and that only in this way can the statesman anticipate the work of time, which alone is able finally to heal such a strife by laying the old generation in the grave. Still less did he inquire who hated him or meditated his assassination. Like every genuine statesman he served not the people for reward--not even for the reward of their love-- but sacrificed the favour of his contemporaries for the blessing of posterity, and above all for the permission to save and renew his nation.
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Reference address : https://www.ellopos.net/elpenor/rome/5-11-old-republic-new-monarchy.asp?pg=25