# std::chrono::operator+, std::chrono::operator- (std::chrono::year_month_weekday_last)

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< cpp‎ | chrono‎ | year month weekday last

constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::months& dm) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::months& dm, const std::chrono::year_month_weekday_last& ymwdl) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::years& dy) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_weekday_last operator+(const std::chrono::years& dy, const std::chrono::year_month_weekday_last& ymwdl) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_weekday_last operator-(const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::months& dm) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_weekday_last operator-(const std::chrono::year_month_weekday_last& ymwdl, const std::chrono::years& dy) noexcept; |  | (since C++20)

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