二进制时间换算

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void GetNowDate(char *datestr,char *format) {     time_t nnowtime = time(NULL);     struct tm tm_nowtime = *(localtime(&nnowtime));     datestr[0] =0;     strftime(datestr, 30, format, &tm_nowtime); } int main() {       char szNowDate[32] = {0};     GetNowDate(szNowDate, (char *)"%Y%m%d");    string strNowDate = szNowDate;    string sYear = strNowDate.substr(0,4);    string sMoth = strNowDate.substr(4,2);    string sDay = strNowDate.substr(6,2);       std::cout<<sYear<<std::endl;     std::cout<<sMoth<<std::endl;     std::cout<<sDay<<std::endl;       int iYear = atoi(sYear.c_str());     int iMoth = atoi(sMoth.c_str());     int iDay = atoi(sDay.c_str());     std::cout<<iYear<<std::endl;     std::cout<<iMoth<<std::endl;     std::cout<<iDay<<std::endl;       int isYear = iYear - 2019;     bitset<6> bs(isYear);         //cout << bs << endl;         string strBs = bs.to_string();           bitset<4> bMoth(iMoth);         string strMoth = bMoth.to_string();         bitset<5> bDay(iDay);         string strDay = bDay.to_string();         std::cout<<strBs<<std::endl;         std::cout<<strMoth<<std::endl;         std::cout<<strDay<<std::endl;