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

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

Forms a std::basic_string<CharT> s consisting of the year value stored in y formatted as a decimal number, left-padded with ​0​ to four digits if the result would otherwise be less than four digits. Then, if !y.ok(), append " is not a valid year" to the formatted string. Inserts that string into os.

Equivalent to

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

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

os

#include <chrono>
#include <iostream>
 
int main()
{
    constexpr std::chrono::year y1{2020}, y2{-020}, y3{98304};
    std::cout << y1 << '\n'
              << y2 << '\n'
              << y3 << '\n';
}

Possible output:

2020
-0016
-32768 is not a valid year

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