Get the current time in milliseconds
/*
Example: get current time in milliseconds in C language
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
int main(void) {
    struct timeval te;
    // Get the current time  
    gettimeofday(&te, NULL);
    // convert into milliseconds
    long long milliseconds = te.tv_sec*1000LL + te.tv_usec/1000;
    printf("milliseconds: %lld\n", milliseconds);
    return 0;
}