std::chrono::month_weekday
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  <chrono>
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|   class month_weekday;  | 
(since C++20) | |
The class month_weekday represents the nth weekday of a specific month, of some yet to be specified year.
month_weekday is a TriviallyCopyable StandardLayoutType.
Member functions
  constructs a month_weekday (public member function)  | |
|   retrieves the stored month and weekday_indexed values  (public member function)  | |
|   checks whether the contained month and weekday_indexed are valid  (public member function)  | 
Nonmember functions
|    (C++20)  | 
  compares two month_weekday values (function)  | 
|    (C++20)  | 
  outputs a month_weekday into a stream (function template)  | 
Helper classes
  formatting support for month_weekday (class template specialization)  | |
|   hash support for std::chrono::month_weekday  (class template specialization)  |