< c‎ | chrono
Defined in header <time.h>
int timespec_get( struct timespec *ts, int base );
(1) (since C11)
#define TIME_UTC /* implementation-defined */
(2) (since C11)
1) Modifies the timespec object pointed to by ts to hold the current calendar time in the time base base.
2) Expands to a value suitable for use as the base argument of 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


[edit] Parameters

ts - pointer to an object of type struct timespec
base - TIME_UTC or another nonzero integer value indicating the time base

[edit] Return value

The value of base if successful, zero otherwise.

[edit] Notes

The POSIX function clock_gettime(CLOCK_REALTIME, ts) may also be used to populate a timespec with the time since the Epoch.

[edit] Example

#include <stdio.h>
#include <time.h>
int main(void)
    struct timespec ts;
    timespec_get(&ts, TIME_UTC);
    char buff[100];
    strftime(buff, sizeof buff, "%D %T", gmtime(&ts.tv_sec));
    printf("Current time: %s.%09ld UTC\n", buff, ts.tv_nsec);

Possible output:

Current time: 02/18/15 14:34:03.048508855 UTC

[edit] References

  • C17 standard (ISO/IEC 9899:2018):
  • The timespec_get function (p: 286)
  • C11 standard (ISO/IEC 9899:2011):
  • The timespec_get function (p: 390)

[edit] See also

time in seconds and nanoseconds
(struct) [edit]
returns the resolution of calendar time based on a given time base
(function) [edit]
returns the current calendar time of the system as time since epoch
(function) [edit]
C++ documentation for timespec_get