23 General utilities library [utilities]
template <class Clock, class Duration1, class Duration2>
constexpr bool operator==(const time_point<Clock, Duration1>& lhs,
const time_point<Clock, Duration2>& rhs);
Returns: lhs.time_since_epoch() == rhs.time_since_epoch(). template <class Clock, class Duration1, class Duration2>
constexpr bool operator!=(const time_point<Clock, Duration1>& lhs,
const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
constexpr bool operator<(const time_point<Clock, Duration1>& lhs,
const time_point<Clock, Duration2>& rhs);
Returns: lhs.time_since_epoch() < rhs.time_since_epoch(). template <class Clock, class Duration1, class Duration2>
constexpr bool operator<=(const time_point<Clock, Duration1>& lhs,
const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
constexpr bool operator>(const time_point<Clock, Duration1>& lhs,
const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
constexpr bool operator>=(const time_point<Clock, Duration1>& lhs,
const time_point<Clock, Duration2>& rhs);