C++で今日の日付をyyyymmddで取得

#include <ctime>

...

　　std::time_t rawtime;
　　std::tm timeinfo;
　　
　　std::time(&rawtime);
　　localtime_s(&timeinfo,&rawtime);
　　long tmpYYYYMMDD = (1900+timeinfo.tm_year) * 10000 + (timeinfo.tm_mon+1) * 100 + timeinfo.tm_mday;

ネタ元

• http://stackoverflow.com/questions/5438482/getting-the-current-time-as-a-yyyy-mm-dd-hh-mm-ss-string