计算任意两个时间之间的秒数

#include <iostream>
#include <stdio.h>
using namespace std;
int main(int argc, char* argv[])
{
struct tm l_time_1;
struct tm l_time_2;
memset(&l_time_1, 0, sizeof(l_time_1));
memset(&l_time_2, 0, sizeof(l_time_2));
strptime("2011-01-01 00:00:21", "%Y-%m-%d %H:%M:%S", &l_time_1);
strptime("2010-12-31 23:59:57", "%Y-%m-%d %H:%M:%S", &l_time_2);
time_t time_1 = mktime(&l_time_1);
time_t time_2 = mktime(&l_time_2);
printf("Time_1 is %s",asctime(&l_time_1));
printf("Time_2 is %s",asctime(&l_time_2));
cout << "seconds between two time: " << difftime(time_1, time_2) << endl;

return 0;
}