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std::chrono::month_day:: month_day

From cppreference.net
C++
Date and time library
std::chrono::month_day
month_day ( ) = default ;
(1) (since C++20)
constexpr month_day ( const std:: chrono :: month & m,
const std:: chrono :: day & d ) noexcept ;
(2) (since C++20)

Constructs a month_day .

1) Default constructor leaves the stored month and day values uninitialized.
2) Constructs a month_day that stores the month m and the day d .

Notes

A more convenient way to construct a month_day is with operator / , e.g., std:: chrono :: April / 1 .

Example

Run this code 
#include <chrono>
#include <iostream>
int main()
{
    using namespace std::chrono_literals;
    constexpr auto mo_da = std::chrono::month_day(std::chrono::February, 29d);
    std::cout << static_cast<unsigned>(mo_da.day()) << '/' 
              << static_cast<unsigned>(mo_da.month()) << '\n';
}

Output: 

29/2

See also

(C++20)
conventional syntax for Gregorian calendar date creation
(function)