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

std::timespec_get - cppreference.com

(1) (since C++17)

#define TIME_UTC /* implementation-defined */

(2) (since C++17) 1)

Modifies the

std::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 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.

[edit] Parameters ts - pointer to an object of type std::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 std::timespec with the time since the Epoch.

[edit] Example

#include <ctime>
#include <iostream>
 
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::cout << "Current time: " << buf << '.' << ts.tv_nsec << " UTC\n";
}

Possible output:

Current time: 06/24/16 20:07:42.949494132 UTC

[edit] See also

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