constexpr bool operator==(const leap_second& x, const leap_second& y) noexcept;
Returns:
x.date() == y.date(). constexpr strong_ordering operator<=>(const leap_second& x, const leap_second& y) noexcept;
Returns:
x.date() <=> y.date(). template<class Duration>
constexpr bool operator==(const leap_second& x, const sys_time<Duration>& y) noexcept;
template<class Duration>
constexpr bool operator<(const leap_second& x, const sys_time<Duration>& y) noexcept;
template<class Duration>
constexpr bool operator<(const sys_time<Duration>& x, const leap_second& y) noexcept;
template<class Duration>
constexpr bool operator>(const leap_second& x, const sys_time<Duration>& y) noexcept;
template<class Duration>
constexpr bool operator>(const sys_time<Duration>& x, const leap_second& y) noexcept;
template<class Duration>
constexpr bool operator<=(const leap_second& x, const sys_time<Duration>& y) noexcept;
template<class Duration>
constexpr bool operator<=(const sys_time<Duration>& x, const leap_second& y) noexcept;
template<class Duration>
constexpr bool operator>=(const leap_second& x, const sys_time<Duration>& y) noexcept;
template<class Duration>
constexpr bool operator>=(const sys_time<Duration>& x, const leap_second& y) noexcept;
template<class Duration>
requires three_way_comparable_with<sys_seconds, sys_time<Duration>>
constexpr auto operator<=>(const leap_second& x, const sys_time<Duration>& y) noexcept;