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

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

Compares two month_day values.

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

Return value

1) x.month() == y.month() && x.day() == y.day()
2) x.month() <=> y.month() != 0 ? x.month() <=> y.month() : x.day() <=> y.day()

Example 

#include <iostream>
#include <chrono>
 
int main()
{
    constexpr auto md1 {std::chrono::August/15};
    constexpr auto md2 {std::chrono::month(8)/std::chrono::day(15)};
    std::cout << std::boolalpha << (md1 == md2) << '\n';
 
    static_assert(md1 <= md2);
}

Output:

true

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