[time.point.general]

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namespace std::chrono { template<class Clock, class Duration = typename Clock::duration> class time_point { public: using clock = Clock; using duration = Duration; using rep = duration::rep; using period = duration::period; private: duration d_; / exposition only public: / [time.point.cons], construct constexpr time_point(); / has value epoch constexpr explicit time_point(const duration& d); / same as time_point() + d template<class Duration2> constexpr time_point(const time_point<clock, Duration2>& t); / [time.point.observer], observer constexpr duration time_since_epoch() const; / [time.point.arithmetic], arithmetic constexpr time_point& operator+(); constexpr time_point operator+(int); constexpr time_point& operator-(); constexpr time_point operator-(int); constexpr time_point& operator+=(const duration& d); constexpr time_point& operator-=(const duration& d); / [time.point.special], special values static constexpr time_point min() noexcept; static constexpr time_point max() noexcept; }; }

If Duration is not a specialization of duration, the program is ill-formed.

30 Time library [time]

30.6 Class template time_point [time.point]

30.6.1 General [time.point.general]