# std::chrono::year_month

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
class year_month; |  | (since C++20)

The class `year_month` represents a specific month of a specific year, but with an unspecified day. It is a field-based time point, with a resolution of std::chrono::months.

`year_month` is a TriviallyCopyable StandardLayoutType.

### Member functions

(constructor) | constructs a `year_month` (public member function)
year month | accesses the stored year and month (public member function)
operator+=operator-= | modifies the `year_month` by some number of months or years (public member function)
ok | checks if this `year_month` is valid (public member function)

### Nonmember functions

operator==operator!=operator<operator<=operator>operator>= | compares two `year_month` objects (function)
operator+operator- | performs arithmetic on `year_month` (function)
operator<< | outputs a `year_month` into a stream (function template)
to_stream | outputs a `year_month` into a stream according to the provided format (function template)
from_stream | parses a `year_month` from a stream according to the provided format (function template)

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