std::chrono::operator<<(std::chrono::day)

Since C++20

Header: <chrono>

Forms a std::basic_string s consisting of the day value stored in d formatted as a decimal number, with a leading zero if the result would otherwise be a single decimal digit. Then, if !d.ok(), append " is not a valid day" to the formatted string. Inserts that string into os.

# Declarations

template< class CharT, class Traits >
std::basic_ostream<CharT, Traits>&
operator<<( std::basic_ostream<CharT, Traits>& os, const std::chrono::day& d );

(since C++20)

# Return value

os

# Example

#include <chrono>
#include <iostream>
 
int main()
{
    constexpr std::chrono::day d1{31}, d2{7}, d3{42}, d4{};
    std::cout << d1 << '\n'
              << d2 << '\n'
              << d3 << '\n'
              << d4 << '\n';
}

# See also