NAME¶

std::chrono::operator<<(std::chrono::sys_time) - std::chrono::operator<<(std::chrono::sys_time)

Synopsis¶

Defined in header <chrono>
template <class CharT, class Traits, class Duration>

std::basic_ostream<CharT, Traits>& (1) (since C++20)
operator<<(std::basic_ostream<CharT, Traits>& os,

const std::chrono::sys_time<Duration>& tp);
template <class CharT, class Traits, class Duration>

std::basic_ostream<CharT, Traits>& (2) (since C++20)
operator<<(std::basic_ostream<CharT, Traits>& os,

const std::chrono::sys_days& tp);

Outputs tp into the stream os.

1) Equivalent to:

return os << std::format(os.getloc(), STATICALLY-WIDEN<CharT>("{:L%F %T}"), tp);

where STATICALLY_WIDEN<CharT>("{:L%F %T}") is "{:L%F %T}" if CharT is char, and
L"{:L%F %T}" if CharT is wchar_t.

This overload participates in overload resolution only if
std::chrono::treat_as_floating_point_v<typename Duration::rep> is false and
Duration(1) < std::chrono::days(1).
2) Equivalent to os << std::chrono::year_month_day(tp);

Return value¶

os.

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¶

std::formatter<std::chrono::sys_time> specialization of std::formatter that formats
(C++20) a sys_time according to the provided format
(class template specialization)
format stores formatted representation of the
(C++20) arguments in a new string
(function template)
operator<< outputs a year_month_day into a stream
(C++20) (function template)