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

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< cpp‎ | chrono‎ | weekday

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

If !wd.ok(), equivalent to os << unsigned(wd) << " is not a valid weekday";. Otherwise, forms a `std::basic_string<CharT>` `s` consisting of the abbreviated weekday name for the weekday represented by `wd`, 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 `weekday` into a stream according to the provided format (function template)

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