time_t start = mktime(&mt);
printf("start1 = %ld\n", start);
printf("start2 = %s", ctime(&start));
printf("(tm_isdst = %d)\n", mt.tm_isdst);
time_t start = mktime(&mt);
printf("start1 = %ld\n", start);
printf("start2 = %s", ctime(&start));
printf("(tm_isdst = %d)\n", mt.tm_isdst);