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

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system_clock::now
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Time point I/O
operator<<
formatter<std::chrono::sys_time>
from_stream

Defined in header`<chrono>`
template<class CharT,class Traits,class Duration> std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os, conststd::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, conststd::chrono::sys_days& tp);	(2)	(since C++20)

Outputstp into the streamos.

1) Equivalent to:

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

whereSTATICALLY_WIDEN<CharT>("{:L%F %T}") is"{:L%F %T}" ifCharT ischar, andL"{:L%F %T}" ifCharT iswchar_t.

This overload participates in overload resolution only ifstd::chrono::treat_as_floating_point_v<typename Duration::rep> isfalse andDuration(1)<std::chrono::days(1).

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

std::formatter<std::chrono::sys_time> (C++20)	formatting support for`sys_time` (class template specialization)[edit]
format (C++20)	stores formatted representation of the arguments in a new string (function template)[edit]
operator<< (C++20)	outputs a`year_month_day` into a stream (function template)[edit]

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