# std::chrono::year::operator+=, std::chrono::year::operator-=

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< cpp‎ | chrono‎ | year

constexpr std::chrono::year & operator+=(const std::chrono::years & y) noexcept; | (1) | (since C++20)
constexpr std::chrono::year & operator-=(const std::chrono::years & y) noexcept; | (2) | (since C++20)

Adds or subtracts y.count() years from the year value.

1) Equivalent to *this = *this + y;
2) Equivalent to *this = *this - y;

### Return value

A reference to this `year` after modification.

### Notes

If the result would be outside the range [-32767, 32767], the actual stored value is unspecified.

### Example

| This section is incomplete Reason: no example

### See also

operator++operator++(int)operator--operator--(int) | increments or decrements the year (public member function)
operator+operator- | performs arithmetic on `year`s (public member function)

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