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std::chrono::operator==,<=>(std::chrono::day)

Defined in header <chrono> 
constexpr bool operator==( const std::chrono::day& x,
                           const std::chrono::day& y ) noexcept;
 (1) (since C++20) 
constexpr std::strong_ordering operator<=>( const std::chrono::day& x,
                                            const std::chrono::day& y ) noexcept;
 (2) (since C++20)

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

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

Return value

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

Example 

#include <iostream>
#include <chrono>
 
int main()
{
    std::chrono::day d1{15};
    std::chrono::day d2{20};
 
    d1 == d2 ? std::cout << "d1 and d2 are equal\n"
             : std::cout << "d1 and d2 are not equal\n";
 
    auto res = d1 <=> d2;
    if (res < 0)
        std::cout << "d1 is less than d2\n";
    else if (res > 0)
        std::cout << "d1 is greater than d2\n";
    else
        std::cout << "d1 and d2 are equal\n";
 
    using namespace std::literals::chrono_literals;
 
    std::cout << std::boolalpha
              << (6d < 9d) << ' ' << (6d == 6d) << ' ' << (6d <= 9d) << ' '
              << (9d > 6d) << ' ' << (9d != 6d) << ' ' << (9d >= 6d) << '\n';
}

Output:

d1 and d2 are not equal
d1 is less than d2
true true true true true true

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