// From time_support.h
// In struct Date_t
// ...
        void toTm (tm *buf);
        std::string toString() const;
        time_t toTimeT() const;
// ...

// Also here are a few helpers that could be exported as well: 
    std::string terseCurrentTime(bool colonsOk=true);
    std::string timeToISOString(time_t time);
    std::string dateToISOStringUTC(Date_t date);
    std::string dateToISOStringLocal(Date_t date);
    std::string dateToCtimeString(Date_t date);   
    bool toPointInTime( const std::string& str , boost::posix_time::ptime* timeOfDay );