字符串转为 时间。时间差，几天，几小时，几分

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const char* pszEndTime =“2021-09-10 12:00:00         struct tm end = { 0 };         sscanf_s(pszEndTime,"%d-%d-%d %d:%d:%d", &end.tm_year, &end.tm_mon, &end.tm_mday             , &end.tm_hour, &end.tm_min, &end.tm_sec);         end.tm_year -= 1900;         end.tm_mon -= 1;         end.tm_isdst = 0;         time_t tEnd = mktime(&end);           time_t tNow;         time(&tNow); //从1970至今多少秒           long fDis = difftime(tEnd, tNow);         int nDay = fDis / (24 * 60 * 60);         int nHour = fDis % (24 * 60 * 60) / (60 * 60);         int nMin = fDis % (24 * 60 * 60) % (60 * 60) / 60;         int nSec = fDis % 60;         nSec = fDis % 60;