std::chrono...ar_month_day(3) C++ Standard Libary std::chrono...ar_month_day(3) NAME std::chrono::year_month_day - std::chrono::year_month_day Synopsis 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+= modifies the time point by some number of months or years operator-= (public member function) year accesses the year, month, and day stored in this ob- ject month (public member function) day operator sys_days converts to a std::chrono::time_point operator local_days (public member function) ok checks if the year_month_day represents a valid date (public member function) Nonmember functions operator== compares two year_month_day values operator<=> (function) (C++20) operator+ adds or subtracts a year_month_day and some number of years or months operator- (function) (C++20) operator<< outputs a year_month_day into a stream (C++20) (function template) from_stream parses a year_month_day from a stream according to the pro- vided format (C++20) (function template) Helper classes std::formatter<std::chrono::year_month_day> formatting support for year_month_day (C++20) (class template specializa- tion) std::hash<std::chrono::year_month_day> hash support for (C++26) std::chrono::year_month_day (class template specializa- tion) Example // Run this code #include <chrono> #include <iostream> int main() { const std::chrono::time_point now{std::chrono::system_clock::now()}; const std::chrono::year_month_day ymd{std::chrono::floor<std::chrono::days>(now)}; std::cout << "Current Year: " << static_cast<int>(ymd.year()) << ", " "Month: " << static_cast<unsigned>(ymd.month()) << ", " "Day: " << static_cast<unsigned>(ymd.day()) << "\n" "ymd: " << ymd << '\n'; } Possible output: Current Year: 2023, Month: 9, Day: 4 ymd: 2023-09-04 http://cppreference.com 2024.06.10 std::chrono...ar_month_day(3)
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