std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday) (3) Linux Manual Page

std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday) – std::chrono::operator+,std::chrono::operator-(std::chrono::year_month_weekday)

Synopsis

constexpr std::chrono::year_month_weekday(1)(since C++ 20)

operator+(const std::chrono::year_month_weekday &ymwd, const std::chrono::months &dm) noexcept;

constexpr std::chrono::year_month_weekday(2)(since C++ 20)

operator+(const std::chrono::months &dm, const std::chrono::year_month_weekday &ymwd) noexcept;

constexpr std::chrono::year_month_weekday(3)(since C++ 20)

operator+(const std::chrono::year_month_weekday &ymwd, const std::chrono::years &dy) noexcept;

constexpr std::chrono::year_month_weekday(4)(since C++ 20)

operator+(const std::chrono::years &dy, const std::chrono::year_month_weekday &ymwd) noexcept;

constexpr std::chrono::year_month_weekday(5)(since C++ 20)

operator-(const std::chrono::year_month_weekday &ymwd, const std::chrono::months &dm) noexcept;

constexpr std::chrono::year_month_weekday(6)(since C++ 20)

operator-(const std::chrono::year_month_weekday &ymwd, const std::chrono::years &dy) noexcept;

1-2) Adds dm.count() months to the date represented by ymwd. The result has the same year() and month() as std::chrono::year_month(ymwd.year(), ymwd.month()) + dm and the same weekday() and index() as ymwd.
3-4) Adds dy.count() years to the date represented by ymwd. The result is equivalent to std::chrono::year_month_weekday(ymwd.year() + dy, ymwd.month(), ymwd.weekday_indexed()).
5) Subtracts dm.count() months from the date represented by ymwd. Equivalent to ymwd + -dm.
6) Subtracts dy.count() years from the date represented by ymwd. Equivalent to ymwd + -dy.

Notes

Even if ymwd.ok() is true, the resulting year_month_weekday may not represent a valid date if ymwd.index() is 5.