| 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.
Member types
| Member type | Definition |
|---|---|
rep | signed arithmetic type representing the number of ticks in the clock's duration |
period | a 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> |
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) |
Member functions
| [static] | returns a std::chrono::time_point representing the current point in time (public static member function) |
| [static] | converts a system clock time point to std::time_t (public static member function) |
| [static] | converts std::time_t to a system clock time point (public static member function) |
See also
| (C++11) | monotonic clock that will never be adjusted (class) |
| (C++11) | the clock with the shortest tick period available (class) |
Please login to continue.