std::chrono::year_month_weekday::operatorsys_days, (3) - Linux Manuals

std::chrono::year_month_weekday::operatorsys_days,: std::chrono::year_month_weekday::operatorsys_days,

NAME

std::chrono::year_month_weekday::operatorsys_days, - std::chrono::year_month_weekday::operatorsys_days,

Synopsis

constexpr operator std::chrono::sys_days() const noexcept;         (1) (since C++20)
explicit constexpr operator std::chrono::local_days() const        (2) (since C++20)
noexcept;

Converts *this to a std::chrono::time_point representing the same date as this
year_month_weekday.

1) If year().ok() && month().ok() && weekday().ok():

  * If index() == 0, returns a sys_days that represents the date 7 days prior to the
 first weekday() of the year and month.
  * Else, returns a sys_days that represents the date (index() - 1) * 7 days after
 the first 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()).