std::chrono::year_month_day
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  <chrono>
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|   class year_month_day;  | 
(since C++20) | |
The class year_month_day represents a specific year, month, and day. It is a field-based time point, with a resolution of std::chrono::days. std::chrono::years- and std::chrono::months-oriented arithmetic are supported directly. An implicit conversion to and from std::chrono::sys_days allows std::chrono::days-oriented arithmetic to be performed efficiently.
year_month_day is a TriviallyCopyable StandardLayoutType.
Member functions
  constructs a year_month_day (public member function)  | |
|    modifies the time point by some number of months or years   (public member function)  | |
|    accesses the year, month, and day stored in this object   (public member function)  | |
|    converts to a std::chrono::time_point  (public member function)  | |
   checks if the year_month_day represents a valid date  (public member function)  | 
Nonmember functions
   compares two year_month_day objects  (function)  | |
   adds or subtracts a year_month_day and some number of years or months  (public member function)  | |
   outputs a year_month_day into a stream  (function template)  | |
   outputs a year_month_day into a stream according to the provided format  (function template)  | |
   parses a year_month_day from a stream according to the provided format  (function template)  |