# std::chrono::year_month_day

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< cpp‎ | chrono

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

The class `year_month_day` represents a specific year, month, and day. It is a field-based time point, with a resolution of std::chrono::days. std::chrono::years- and std::chrono::months-oriented arithmetic are supported directly. An implicit conversion to and from std::chrono::sys_days allows std::chrono::days-oriented arithmetic to be performed efficiently.

`year_month_day` is a TriviallyCopyable StandardLayoutType.

### Member functions

(constructor) | constructs a `year_month_day` (public member function)
operator+=operator-= | modifies the time point by some number of months or years (public member function)
year month day | accesses the year, month, and day stored in this object (public member function)
operator sys_days operator local_days | converts to a std::chrono::time_point (public member function)
ok | checks if the `year_month_day` represents a valid date (public member function)

### Nonmember functions

operator==operator!=operator<operator<=operator>operator>= | compares two `year_month_day` objects (function)
operator+operator- | adds or subtracts a `year_month_day` and some number of years or months (public member function)
operator<< | outputs a `year_month_day` into a stream (function template)
to_stream | outputs a `year_month_day` into a stream according to the provided format (function template)
from_stream | parses a `year_month_day` from a stream according to the provided format (function template)

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