std::chrono::month_weekday:: month, std::chrono::month_weekday:: weekday_indexed

From cppreference.com
Utilities library
General utilities
Relational operators (deprecated in C++20)
constexpr std:: chrono :: month month ( ) const noexcept ;
(1) (since C++20)
constexpr std:: chrono :: weekday_indexed weekday_indexed ( ) const noexcept ;
(2) (since C++20)

Retrieves a copy of the month and weekday_indexed objects stored in * this .

Return value

1) A copy of the std::chrono::month object stored in * this .
2) A copy of the std::chrono::weekday_indexed object stored in * this .

Example

#include <chrono>
#include <iostream>
 
int main()
{
    std::cout << std::boolalpha;
 
    auto mwdi{std::chrono::March/std::chrono::Friday[1]}; // 1st Friday in a March
    std::cout << (std::chrono::year_month_day{mwdi/2024} == 
                  std::chrono::year_month_day{std::chrono::March/1/2024})
                  << ' ';
    auto index = mwdi.weekday_indexed().index();
    auto weekday = mwdi.weekday_indexed().weekday();
    mwdi = {mwdi.month(), weekday[index + 4]}; // 5th Friday in a March
    std::cout << (std::chrono::year_month_day{mwdi/2024} == 
                  std::chrono::year_month_day{std::chrono::March/29/2024})
                  << '\n';
}

Output:

true true