std::chrono::weekday_indexed::weekday
From cppreference.com
                    
                                        
                    < cpp | chrono | weekday indexed
                    
                                                            
                    | constexpr std::chrono::weekday weekday() const noexcept; | (since C++20) | |
Retrieves a copy of the std::chrono::weekday object stored in *this.
Return value
A copy of the std::chrono::weekday object stored in *this.