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

Outputs a textual representation of mwdl into os, as if by.

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

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

Return value


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

stores formatted representation of the arguments in a new string
(function template)
specialization of std::formatter that formats a month according to the provided format
(class template specialization)

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