Compilation error when using 'gettimeofday64' was not declared in this scope

Question

I am trying to use gettimeofday64() instead of gettimeofday() function.

 #include <time.h>
 #include <stdio.h>

 int main () {
    struct timeval64 tim;
    int ret = gettimeofday64(&tim, NULL);

    printf("Ret = %d\n", ret);

 return 0;
 } 

Getting compilation error:
day.cpp: In function ‘int main()’:
day.cpp:5: error: aggregate ‘timeval64 tim’ has incomplete type and cannot be defined
day.cpp:6: error: ‘gettimeofday64’ was not declared in this scope

The same code works when used getimeofday() with header #include <sys/time.h> Why i am getting error for using gettimeofday64()?