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    std::chrono::year_month_day_last

    From cppreference.com
     
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    std::chrono::year_month_day_last
     
    Defined in header <chrono> 
    class year_month_day_last;
    		(since C++20)

    The class year_month_day_last represents the last day of a specific year and month. It is a field-based time point, with a resolution of std::chrono::days, subject to the limit that it can only represent the last day of a month.

    std::chrono::years- and std::chrono::months-oriented arithmetic are supported directly. An implicit conversion to std::chrono::sys_days allows std::chrono::days-oriented arithmetic to be performed efficiently.

    year_month_day_last is a TriviallyCopyable StandardLayoutType.

    Member functions

    		 constructs a year_month_day_last object
    (public member function) [edit]
    		modifies the time point by some number of months or years
    (public member function) [edit]
    		accesses the fields of this object
    (public member function) [edit]
    		converts to a std::chrono::time_point
    (public member function) [edit]
    		checks whether this object represents a valid date
    (public member function) [edit]

    Nonmember functions

    (C++20)
    		 compares two year_month_day_last values
    (function) [edit]
    (C++20)
    		 adds or subtracts a year_month_day_last and some number of years or months
    (function) [edit]
    (C++20)
    		 outputs a year_month_day_last into a stream
    (function template) [edit]

    Helper classes

    (C++20)
    		 formatting support for year_month_day_last
    (class template specialization) [edit]
    (C++26)
    		 hash support for std::chrono::year_month_day_last
    (class template specialization)

    Example

    Run this code
    #include <chrono>
#include <iostream>

int main()
{
    const auto ymd = std::chrono::year_month_day
    {
        std::chrono::floor<std::chrono::days>(std::chrono::system_clock::now())
    };
    
    const std::chrono::year_month_day_last ymdl
    {
        ymd.year(), ymd.month() / std::chrono::last
    };
    
    std::cout << "The last day of present month (" << ymdl << ") is: "
              << std::chrono::year_month_day{ymdl}.day() << '\n';
    
    // The 'last' object can be placed wherever it is legal to place a 'day':
    using namespace std::chrono;
    constexpr std::chrono::year_month_day_last
        ymdl1 = 2023y / February / last,
        ymdl2 = last / February / 2023y,
        ymdl3 = February / last / 2023y;
    static_assert(ymdl1 == ymdl2 && ymdl2 == ymdl3);
}

    Possible output: 

    The last day of present month (2023/Aug/last) is: 31

    See also

    (C++20)
    		 represents a specific year, month, and day
    (class) [edit]