Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2013. The current version is 1.91.0.
boost::local_time::operator+=
local_date_time operator+=(local_date_time & t, const boost::gregorian::months & m);