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Showing content from https://en.cppreference.com/w/cpp/chrono/year_month_day/operator_ltlt.html below:

std::chrono::operator<<(std::chrono::year_month_day) - cppreference.com

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.

os

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