std::chrono::weekday_last
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header  <chrono> | ||
| class weekday_last; | (since C++20) | |
The class weekday_last represents the last weekday of some month.
weekday_last is a TriviallyCopyable StandardLayoutType.
Member functions
| constructs a weekday_lastobject(public member function) | |
| accesses the stored weekday (public member function) | |
| checks if the stored weekday is valid (public member function) | 
Nonmember functions
| compares two weekday_lastobjects(function) | |
| outputs a weekday_lastinto a stream(function template) |