std::chrono::year_month_day_last

 

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std::chrono::year_month_day_last

Member functions

year_month_day_last::year_month_day_last

year_month_day_last::operator+=year_month_day_last::operator-=

year_month_day_last::yearyear_month_day_last::monthyear_month_day_last::dayyear_month_day_last::month_day_last

year_month_day_last::operator sys_daysyear_month_day_last::operator local_days

year_month_day_last::ok

Nonmember functions

operator==operator<=>

operator+operator-

operator<<

Helper classes

formatter<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

(constructor)	constructs a year_month_day_last object (public member function)
operator+=operator-=	modifies the time point by some number of months or years (public member function)
yearmonthdaymonth_day_last	accesses the fields of this object (public member function)
operator sys_daysoperator local_days	converts to a std::chrono::time_point (public member function)
ok	checks whether this object represents a valid date (public member function)

Nonmember functions

operator==operator<=> (C++20)	compares two year_month_day_last values (function)
operator+operator- (C++20)	adds or subtracts a year_month_day_last and some number of years or months (function)
operator<< (C++20)	outputs a year_month_day_last into a stream (function template)

Helper classes

std::formatter<std::chrono::year_month_day_last> (C++20)

specialization of std::formatter that formats a year_month_day_last according to the provided format (class template specialization)

Example

Run this code

#include <iostream>
#include <chrono>
 
// until online compiler supports streaming the year_month_day_last:
std::ostream& operator<< (std::ostream& os, std::chrono::year_month_day_last ymdl) {
    return os << static_cast<int>(ymdl.year()) << '/' 
              << static_cast<unsigned>(ymdl.month()) << '/'
              << static_cast<unsigned>(ymdl.day());
}
 
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 date of the last day of this month is: " << ymdl << '\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 and ymdl2 == ymdl3 );
}

Possible output:

The date of the last day of this month is: 2021/11/30

See also

year_month_day (C++20)

represents a specific year, month, and day (class)