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
Measures against Absentees from Italy - Measures for the Elevation of the Family
With a view to check the continued absence of the Italians from Italy
and to induce the world of quality and the merchants to establish
their homes in their native land, not only was the term of service
for the soldiers shortened, but men of senatorial rank were
altogether prohibited from taking up their abode out of Italy
except when on public business, while the other Italians
of marriageable age (from the twentieth to the fortieth year)
were enjoined not to be absent from Italy for more than three
consecutive years.
In the same spirit Caesar had already,
in his first consulship on founding the colony of Capua kept specially
in view fathers who had several children;(62) and now as Imperator
he proposed extraordinary rewards for the fathers of numerous families,
while he at the same time as supreme judge of the nation
treated divorce and adultery with a rigour according
to Roman ideas unparalleled.