C program to find difference between two times.

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

int main()
{
struct timeval current_time;
struct timeval past_time;

gettimeofday(&current_time,NULL); // This function will update structure timeval  with current time stamp.

past_time.tv_sec = 1351257149; //.tv_sec holds time value in seconds. I have hard coded a value for it directly.

printf("The difference between past and present time = %ld",current_time.tv_sec-past_time.tv_sec );

return 0;
}