< cpp‎ | chrono‎ | hh mm ss
Utilities library
General utilities
Date and time
Function objects
Formatting library (C++20)
Relational operators (deprecated in C++20)
Integer comparison functions
Swap and type operations
Common vocabulary types
Elementary string conversions
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::hh_mm_ss<Duration>& t );
(since C++20)

Outputs t into the stream os.

Equivalent to return os << std::format(os.getloc(), STATICALLY_WIDEN<CharT>("{:L%T}"), hms); where STATICALLY_WIDEN<CharT>("{:L%T}") is "{:L%T}" if CharT is char, and L"{:L%T}" if CharT is wchar_t.


[edit] Parameters

os - the output stream.
t - the time of day to be output.

[edit] Return value


[edit] Example

[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

stores formatted representation of the arguments in a new string
(function template) [edit]
specialization of std::formatter that formats a hh_mm_ss according to the provided format
(class template specialization) [edit]