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

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< cpp‎ | chrono‎ | year month day last

Defined in header `<chrono>` |  |
constexpr std::chrono::year_month_day_last operator+(const std::chrono::year_month_day_last& ymdl, const std::chrono::months& dm) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_day_last operator+(const std::chrono::months& dm, const std::chrono::year_month_day_last& ymdl) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_day_last operator+(const std::chrono::year_month_day_last& ymdl, const std::chrono::years& dy) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_day_last operator+(const std::chrono::years& dy, const std::chrono::year_month_day_last& ymdl) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_day_last operator-(const std::chrono::year_month_day_last& ymdl, const std::chrono::months& dm) noexcept; |  | (since C++20)
constexpr std::chrono::year_month_day_last operator-(const std::chrono::year_month_day_last& ymdl, const std::chrono::years& dy) noexcept; |  | (since C++20)

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