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
The rapidity and self-precision with which the plan was executed
prove that it had been long meditated thoroughly and all its parts
settled in detail; but, even thus, they remain not much less wonderful than
the plan itself. The outlines were laid down and thereby the new state
was defined for all coming time; the boundless future alone could complete
the structure. So far Caesar might say, that his aim was attained;
and this was probably the meaning of the words which were sometimes
heard to fall from him--that he had "lived enough."
But precisely because
the building was an endless one, the master as long as he lived restlessly
added stone to stone, with always the same dexterity and always the same
elasticity busy at his work, without ever overturning or postponing,
just as if there were for him merely a to-day and no to-morrow.
Thus he worked and created as never did any mortal before or after him;
and as a worker and creator he still, after wellnigh two thousand years,
lives in the memory of the nations--the first, and withal unique,
Imperator Caesar.