c/chrono/timespec get

@1@ Modifies the timespec object pointed to by to hold the current calendar time in the time base. @2@ Expands to a value suitable for use as the argument of

Other macro constants beginning with may be provided by the implementation to indicate additional time bases

If is, then
 * is set to the number of seconds since an implementation defined epoch, truncated to a whole value
 * member is set to the integral number of nanoseconds, rounded to the resolution of the system clock

Return value
The value of if successful, zero otherwise.