27 Time library [time]

27.10 Time zones [time.zone]

27.10.9 Class link [time.zone.link]

27.10.9.3 Non-member functions [time.zone.link.nonmembers]

bool operator==(const link& x, const link& y) noexcept;
Returns: x.name() == y.name().
bool operator<(const link& x, const link& y) noexcept;
Returns: x.name() < y.name().