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

From cppreference.com
< cpp‎ | chrono‎ | year month day last

Defined in header `<chrono>` |  |
template< class CharT, class Traits > std::basic_ostream <CharT, Traits>& operator<<( std::basic_ostream <CharT, Traits>& os, const std::chrono::year_month_day_last & ymdl ); |  | (since C++20)

Outputs a textual representation of ymdl into os, as if by

os << std::format (os.getloc(), STATICALLY_WIDEN<CharT>("{}/{:L}"),
ymdl.year(), ymdl.month_day_last());

where STATICALLY_WIDEN<CharT>("{}/{:L}") is "{}/{:L}" if `CharT` is char, and L"{}/{:L}" if `CharT` is wchar_t.

### Return value

os

### Example

| This section is incomplete Reason: no example

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
P2372R3 | C++20 | the given locale was used by default | `L` is needed to use the given locale

### See also

format (C++20) | stores formatted representation of the arguments in a new string (function template)
std::formatter<std::chrono::year_month_day> (C++20) | formatting support for `year_month_day` (class template specialization)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/year_month_day_last/operator_ltlt&oldid=161705"