std::chrono::operator ==,!=,<,<=,>,>= (std::chrono::year)
 constexpr bool operator==(const std::chrono::year& x, const std::chrono::year& y) noexcept;  |  (1) | (since C++20) | 
 constexpr bool operator!=(const std::chrono::year& x, const std::chrono::year& y) noexcept;  |  (2) | (since C++20) | 
 constexpr bool operator< (const std::chrono::year& x, const std::chrono::year& y) noexcept;  |  (3) | (since C++20) | 
 constexpr bool operator<=(const std::chrono::year& x, const std::chrono::year& y) noexcept;  |  (4) | (since C++20) | 
 constexpr bool operator> (const std::chrono::year& x, const std::chrono::year& y) noexcept;  |  (5) | (since C++20) | 
 constexpr bool operator>=(const std::chrono::year& x, const std::chrono::year& y) noexcept;  |  (6) | (since C++20) | 
Compare the two std::chrono::year x and y.
Return value
1) 
 int(x) == int(y)
2) 
 int(x) != int(y)
3) 
 int(x) < int(y)
4) 
 int(x) <= int(y)
5) 
 int(x) > int(y)
6) 
          int(x) >= int(y)
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