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    std::chrono::operator<<(std::chrono::year_month_weekday_last)

    From cppreference.net
     
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    std::chrono::year_month_weekday_last
     
    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_weekday_last& ymwdl );
    		(since C++20)

    Outputs a textual representation of ymwdl into os, as if by

    os << std::format(os.getloc(), STATICALLY_WIDEN<CharT>("{}/{:L}/{:L}"), ymwdl.year(), ymwdl.month(), ymwdl.weekday_last());

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

    Return value

    os

    Defect reports

    The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

    DR Applied to Behavior as published Correct behavior
    P2372R3 C++20 the given locale was used by default L is needed to use the given locale

    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)