Defined in header <ctime> | ||
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int timespec_get( std::timespec* ts, int base) | (since C++17) | |
#define TIME_UTC /* implementation-defined */ | (since C++17) |
std::timespec object pointed to by ts to hold the current calendar time in the time base base.base argument of std::timespec_get
Other macro constants beginning with TIME_ may be provided by the implementation to indicate additional time bases.
If base is TIME_UTC, then.
ts->tv_sec is set to the number of seconds since an implementation defined epoch, truncated to a whole value ts->tv_nsec member is set to the integral number of nanoseconds, rounded to the resolution of the system clock | ts | - | pointer to an object of type std::timespec |
| base | - | TIME_UTC or another nonzero integer value indicating the time base |
The value of base if successful, zero otherwise.
The POSIX function clock_gettime(CLOCK_REALTIME, ts) may also be used to populate a std::timespec with the time since the Epoch.
#include <cstdio>
#include <ctime>
int main()
{
std::timespec ts;
std::timespec_get(&ts, TIME_UTC);
char buf[100];
std::strftime(buf, sizeof buf, "%D %T", std::gmtime(&ts.tv_sec));
std::printf("Current time: %s.%09ld UTC\n", buf, ts.tv_nsec);
}Possible output:
Current time: 06/24/16 20:07:42.949494132 UTC
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(since C++17) | time in seconds and nanoseconds (struct) |
| returns the current time of the system as time since epoch (function) |
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C documentation for timespec_get |
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