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

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< cpp‎ | chrono‎ | month

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

If !m.ok(), equivalent to os << unsigned(m) << " is not a valid month";. Otherwise, forms a `std::basic_string<CharT>` `s` consisting of the abbreviated month name for the month represented by `m`, determined using the locale associated with `os`, and inserts `s` into `os`.

### Return value

`os`.

### Notes

This `operator<<` is primarily intended for debugging use. For control over formatting, use std::chrono::format.

### See also

format (C++20) | formats a streamable `chrono` object for insertion (function template)
to_stream | outputs a `month` into a stream according to the provided format (function template)

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