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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/../c/chrono/timespec_get.html below:

timespec_get - cppreference.com

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

[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
[edit] See also

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