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std::chrono::system_clock

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Defined in header <chrono>
class system_clock;
(since C++11)

Class std::chrono::system_clock represents the system-wide real time wall clock.

It may not be monotonic: on most systems, the system time can be adjusted at any moment. It is the only C++ clock that has the ability to map its time points to C-style time, and, therefore, to be displayed.

std::chrono::system_clock meets the requirements of TrivialClock.

Contents

[edit] Member types

Member type Definition
rep signed arithmetic type representing the number of ticks in the clock's duration
period an std::ratio type representing the tick period of the clock, in seconds
duration std::chrono::duration<rep, period>, capable of representing negative durations
time_point std::chrono::time_point<std::chrono::system_clock>

[edit] Member constants

constexpr bool is_steady
[static]
true if the time between ticks is always constant, i.e. calls to now() return values that increase monotonically even in case of some external clock adjustment
(public static member constant)

[edit] Member functions

[static]
returns a std::chrono::time_point representing the current point in time
(public static member function) [edit]
[static]
converts a system clock time point to std::time_t
(public static member function) [edit]
[static]
converts std::time_t to a system clock time point
(public static member function) [edit]

[edit] See also

monotonic clock that will never be adjusted
(class)
the clock with the shortest tick period available
(class)