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

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

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

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

1) unsigned(x) == unsigned(y)

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

#include <chrono>
#include <iostream>
 
int main()
{
    constexpr std::chrono::day x{13}, y{31};
    static_assert(x != y);
 
    if constexpr (constexpr auto res = x <=> y; res < 0)
        std::cout << "x is less than y\n";
    else if constexpr (res > 0)
        std::cout << "x is greater than y\n";
    else
        std::cout << "x and y are equal\n";
 
    using namespace std::literals::chrono_literals;
 
    static_assert
    (
        (6d < 9d) && (6d == 6d) && (6d <= 9d) &&
        (9d > 6d) && (9d != 6d) && (9d >= 6d)
    );
}

Output:

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