std::chrono:: weekday_last

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C-style date and time

The class weekday_last represents the last weekday of some month.

(constructor)	constructs a `weekday_last` object (public member function)
weekday	accesses the stored `weekday` (public member function)
ok	checks if the stored `weekday` is valid (public member function)

operator== (C++20)	compares two `weekday_last` values (function)
operator<< (C++20)	outputs a `weekday_last` into a stream (function template)

std::formatter <std::chrono::weekday_last> (C++20)	formatting support for `weekday_last` (class template specialization)
std::hash <std::chrono::weekday_last> (C++26)	hash support for `std::chrono::weekday_last` (class template specialization)

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