std::chrono::year_month_weekday_last::operator sys_days, std::chrono::year_month_weekday_last::operator local_days
From cppreference.com
                    
                                        
                    < cpp | chrono | year month weekday last
                    
                                                            
                    | constexpr operator std::chrono::sys_days() const noexcept; | (1) | (since C++20) | 
| explicit constexpr operator std::chrono::local_days() const noexcept; | (2) | (since C++20) | 
Converts *this to a std::chrono::time_point representing the same date as this year_month_weekday_last.
1) If ok() is true, returns a 
sys_days that represents the last weekday() of the year() and month(). Otherwise, the returned value is unspecified.2) Same as (1), but returns 
local_days instead of sys_days. Equivalent to local_days(sys_days(*this).time_since_epoch()).