{

struct timeval tv;

gettimeofday(&tv,NULL);

std::cout<<tv.tv_sec<<endl;

std::cout<<tv.tv_usec<<endl;

struct timespec tn;

cout<<"----";

clock_gettime(CLOCK_REALTIME, &tn);

std::cout<<tn.tv_nsec<<endl;

std::cout<<tn.tv_sec<<endl;

//sleep(1);

cout<<"----";

double a = tv.tv_sec + tv.tv_usec/1000000.;

std::cout<<a<<"double"<<endl;

time_t le=time(NULL);

std::cout<<le<<endl;

struct tm *tmday=localtime(&le);

cout<<tmday->tm_year<<",";

cout<<tmday->tm_mon<<",";

cout<<tmday->tm_mday<<",";

cout<<tmday->tm_hour<<",";

cout<<tmday->tm_min<<",";

cout<<tmday->tm_sec<<",\n";

tmday->tm_hour=0;

tmday->tm_min=0;

tmday->tm_sec=0;

cout<<"stamp"<<mktime(tmday)<<endl;

struct timespec current_time,last_time;

double aa=1.1234567891;

printf("double %.12f\n",aa);

cout<<"----";

clock_gettime(CLOCK_REALTIME, &last_time);

sleep(1);

std::cout<<last_time.tv_sec<<","<<last_time.tv_nsec<<endl;

clock_gettime(CLOCK_REALTIME, &current_time);

std::cout<<current_time.tv_sec<<","<<current_time.tv_nsec<<","<<pow(10,-9)<<endl;

double delta_time = (current_time.tv_sec - last_time.tv_sec)+ (current_time.tv_nsec - last_time.tv_nsec)*pow(10,-9);

printf("double %.12f\n",delta_time);