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

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

Compares the two year_month values x and y.

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

1) x.year() == y.year() && x.month() == y.month()

2) x.year() <=> y.year() != 0 ? x.year() <=> y.year() : x.month() <=> y.month()

#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::chrono;
 
    constexpr year_month ym1{year(2021), month(7)};
    constexpr year_month ym2{year(2021)/7};
    static_assert(ym1 == ym2);
    std::cout << ym1 << '\n';
 
    static_assert((2020y/1 < 2020y/2) && (2020y/2 == 2020y/2) && (2020y/3 <= 2021y/3) &&
                  (2023y/1 > 2020y/2) && (3020y/2 != 2020y/2) && (2020y/3 >= 2020y/3));
}

Output:

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