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

Header <boost/icl/ptime.hpp>

namespace boost {
  namespace icl {
    template<> struct is_discrete<boost::posix_time::ptime>;
    template<> struct has_difference<boost::posix_time::ptime>;
    template<> struct difference_type_of<boost::posix_time::ptime>;
    template<> struct size_type_of<boost::posix_time::ptime>;
    template<> struct is_discrete<boost::posix_time::time_duration>;
    template<> struct has_difference<boost::posix_time::time_duration>;
    template<> struct size_type_of<boost::posix_time::time_duration>;
    boost::posix_time::ptime operator++(boost::posix_time::ptime & x);
    boost::posix_time::ptime operator--(boost::posix_time::ptime & x);
    boost::posix_time::time_duration 
    operator++(boost::posix_time::time_duration & x);
    boost::posix_time::time_duration 
    operator--(boost::posix_time::time_duration & x);
  }
}