std::chrono::month_day
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  <chrono>
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|   class month_day;  | 
(since C++20) | |
The class month_day represents a specific day of a specific month, of some yet to be specified year.
month_day is a TriviallyCopyable StandardLayoutType.
Member functions
  constructs a month_day (public member function)  | |
|   retrieve the stored month and day values  (public member function)  | |
  checks if the month_day is valid (public member function)  | 
Nonmember functions
|    (C++20)  | 
  compares two month_day values (function)  | 
|    (C++20)  | 
  outputs a month_day into a stream (function template)  | 
|    (C++20)  | 
  parses a month_day from a stream according to the provided format (function template)  | 
Helper classes
  formatting support for month_day (class template specialization)  | |
|   hash support for std::chrono::month_day  (class template specialization)  |