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

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< cpp‎ | chrono‎ | system clock
 
 
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Defined in header <chrono>
template <class CharT, class Traits, class Duration>

std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os,

           const std::chrono::sys_time<Duration>& tp);
(1) (since C++20)
template <class CharT, class Traits, class Duration>

std::basic_ostream<CharT, Traits>&
operator<<(std::basic_ostream<CharT, Traits>& os,

           const std::chrono::sys_days& tp);
(2) (since C++20)

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);

[edit] Return value

os.

[edit] 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

[edit] See also

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