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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/../cpp/chrono/system_clock/operator_ltlt.html below:

std::chrono::operator<<(std::chrono::sys_time) - cppreference.com

(1) (since C++20) (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)

.

[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

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