std::chrono::year
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  <chrono>
  | 
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|   class year;  | 
(since C++20) | |
The class year represents a year in the proleptic Gregorian calendar. Its range is [-32767, 32767].
year is a TriviallyCopyable StandardLayoutType.
Member functions
  constructs a year (public member function)  | |
|   increments or decrements the year  (public member function)  | |
  adds or subtracts a number of years from a year (public member function)  | |
  applies unary operators to year (public member function)  | |
|   determines if the year is a leap year  (public member function)  | |
|   retrieve the year value  (public member function)  | |
|   checks if the stored year value is valid  (public member function)  | |
|    [static]  | 
  returns the smallest possible year value  (public static member function)  | 
|    [static]  | 
  returns the largest possible year (public static member function)  | 
Non-member functions
|    (C++20)  | 
  compares two year values (function)  | 
|    (C++20)  | 
  performs arithmetic on years (function)  | 
|    (C++20)  | 
  outputs a year into a stream (function template)  | 
|    (C++20)  | 
  parses a year from a stream according to the provided format (function template)  | 
Helper classes
  formatting support for year (class template specialization)  | |
|    (C++26)  | 
  hash support for std::chrono::year  (class template specialization)  | 
Literals
|   Defined in inline namespace  
std::literals::chrono_literals  | |
|    (C++20)  | 
  a std::chrono::year literal representing a particular year  (function)  |