std::chrono::operator ==,!= (std::chrono::weekday)
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   constexpr bool operator==(const std::chrono::weekday& x, const std::chrono::weekday& y) noexcept;  | 
(since C++20) | |
|   constexpr bool operator!=(const std::chrono::weekday& x, const std::chrono::weekday& y) noexcept;  | 
(since C++20) | |
Compare the two std::chrono::weekday x and y.
Return value
1) unsigned(x) == unsigned(y)
2) unsigned(x) != unsigned(y)
Notes
weekday does not support the <, <=, > and >= operators because there is no universal consensus on which day is the first day of the week.