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    std::chrono::operator<<(std::chrono::year_month_day)

    From cppreference.net
     
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    Date and time library
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    chrono I/O
    (C++20)

     
    std::chrono::year_month_day
     
    Defined in header <chrono> 
    template< class CharT, class Traits >
std::basic_ostream<CharT, Traits>&
    operator<<( std::basic_ostream<CharT, Traits>& os,
                const std::chrono::year_month_day& ymd );
    		(since C++20)

    Outputs a textual representation of ymd into the stream os. This first forms a std::basic_string<CharT> s consisting of a textual representation of the date in the format yyyy-mm-dd (same as the one output by formatter with the %F specifier). Then, if !ymd.ok(), appends " is not a valid date" to s. Inserts s into os.

    Equivalent to

    return os << (ymd.ok() ? std::format(STATICALLY_WIDEN<CharT>("{:%F}"), ymd) : std::format(STATICALLY_WIDEN<CharT>("{:%F} is not a valid date"), ymd));

    where STATICALLY_WIDEN<CharT>("...") is "..." if CharT is char, and L"..." if CharT is wchar_t.

    Return value

    os

    Example

    This section is incomplete
    Reason: no example

    See also

    (C++20)
    		 stores formatted representation of the arguments in a new string
    (function template)
    (C++20)
    		 formatting support for year_month_day
    (class template specialization)