# std::chrono::operator<< (std::chrono::month_day)

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< cpp‎ | chrono‎ | month day

template< class CharT, class Traits > std::basic_ostream <CharT, Traits>& operator<<( std::basic_ostream <CharT, Traits>& os, const std::chrono::month_day & md); |  | (since C++20)

Outputs a textual representation of `md` into the stream `os`, as if by os << md.month() << '/' << md.day().

### Return value

`os`.

### Notes

This `operator<<` is primarily intended for debugging use. When used with non-default stream flags, the output may be surprising:

    auto md = std::chrono::February/1;
    std::cout.width(10);
    std::cout.fill('-');
    std::cout << std::left << md; // may output "Feb-------/01"

For control over formatting, use std::chrono::format.

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