在html页面比较两个时间戳,如何比较C中的两个时间戳？

谷歌时间给

this first result.从那个页面：

通常需要减去struct timeval或struct timespec的两个值.这是最好的方法.即使在某些特殊的操作系统中,tv_sec成员具有无符号类型,它也可以工作.

/* Subtract the `struct timeval' values X and Y,storing the result in RESULT.

Return 1 if the difference is negative,otherwise 0. */

int

timeval_subtract (result,x,y)

struct timeval *result,*x,*y;

{

/* Perform the carry for the later subtraction by updating y. */

if (x->tv_usec < y->tv_usec) {

int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;

y->tv_usec -= 1000000 * nsec;

y->tv_sec += nsec;

}

if (x->tv_usec - y->tv_usec > 1000000) {

int nsec = (x->tv_usec - y->tv_usec) / 1000000;

y->tv_usec += 1000000 * nsec;

y->tv_sec -= nsec;

}

/* Compute the time remaining to wait.

tv_usec is certainly positive. */

result->tv_sec = x->tv_sec - y->tv_sec;

result->tv_usec = x->tv_usec - y->tv_usec;

/* Return 1 if result is negative. */

return x->tv_sec < y->tv_sec;

}