IGES timestamp.
public time_pointusing duration = clock::durationusing time_point = clock::time_pointusing clock = std::chrono::system_clockprint() const -> iges_date_ppempty() const -> boolclear() -> voidoperator=(const time_point & rhs) -> timestamp ×tamp(const time_point & tp)~timestamp()timestamp()operator<<(std::ostream & out, const timestamp::iges_date_pp & rhs) -> std::ostream &operator<<(iges_ostream & out, const timestamp & rhs) -> iges_ostream &operator>>(std::istream & in, timestamp & rhs) -> std::istream &operator<<(std::ostream & out, const timestamp & rhs) -> std::ostream &