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Showing content from https://en.cppreference.com/w/cpp/algorithm/../algorithm/../chrono/year/operator_cmp.html below:

std::chrono::operator==,<=>(std::chrono::year) - cppreference.com

Compare the two std::chrono::year x and y.

The <, <=, >, >=, and != operators are synthesized from operator<=> and operator== respectively.

[edit] Return value

1) int(x) == int(y)

2) int(x) <=> int(y)

[edit] Example
#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::chrono;
 
    constexpr year y1{2020};
    constexpr year y2{2021};
 
    std::cout << std::boolalpha << (y1 != y2) << '\n';
 
    static_assert((2020y < 2023y) && (2020y == 2020y) && (2020y <= 2023y) &&
                  (2023y > 2020y) && (2023y != 2020y) && (2023y >= 2020y));
}

Output:


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