Method Datetime,double>

inst/include/Rcpp/date_datetime/Datetime.h:128–130

    // needed to wrap containers of Date such as vector<Datetime> or map<string,Datetime>
    namespace internal {
        template<> inline double caster<Rcpp::Datetime,double>(Rcpp::Datetime from) {
            return from.getFractionalTimestamp();
        }
        template<> inline Rcpp::Datetime caster<double,Rcpp::Datetime>(double from) {
            return Rcpp::Datetime( from );
        }