std::chrono::year_month_weekday::year, std::chrono::year_month_weekday::month, std::chrono::year_month_weekday::weekday, std::chrono::year_month_weekday::index, std::chrono::year_month_weekday::weekday_indexed

constexpr std::chrono::year year() const noexcept;	(1)	(since C++20)
constexpr std::chrono::month month() const noexcept;	(2)	(since C++20)
constexpr std::chrono::weekday weekday() const noexcept;	(3)	(since C++20)
constexpr unsigned index() const noexcept;	(4)	(since C++20)
constexpr std::chrono::weekday_indexed weekday_indexed() const noexcept;	(5)	(since C++20)

Возвращает значения полей, сохраненные в этом объекте year_month_weekday.

Результат

1) Возвращает сохраненное значение std::chrono::year.

2) Возвращает сохраненное значение std::chrono::month.

3) Возвращает сохраненное значение std::chrono::weekday.

4) Возвращает индекс дня недели.

5) weekday()[index()]

Пример

#include <cassert>
#include <chrono>
 
int main()
{
    constexpr auto ym{std::chrono::year(2021)/std::chrono::January};
    constexpr auto wdi{std::chrono::Wednesday[1]};
    auto ymwdi{ym/wdi};
    const auto index{ymwdi.index() + 1};
    auto weekday{ymwdi.weekday() + std::chrono::days(1)};
    ymwdi = {ymwdi.year()/ymwdi.month()/weekday[index]};
    // Second Thursday in January, 2021
    assert(std::chrono::year_month_day{ymwdi} == std::chrono::January/14/2021);
}

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