#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>

int main(void);
int main(void)
{
 printf("\n");
 while (1)
  { struct timeval now;
    struct timeval interval;
    gettimeofday(&now,0);
    printf("\r%.24s",ctime(&now.tv_sec));
    fflush(stdout);
    if (now.tv_usec)
     { interval.tv_sec = 0;
       interval.tv_usec = 1000000 - now.tv_usec;
     }
    else
     { interval.tv_sec = 1;
       interval.tv_usec = 0;
     }
    select(0,0,0,0,&interval);
  }
}