C函数--获取当前系统函数

需要头文件：
#include


int GetFullSystemDateTime(char *datetime)  ----获取十四位的时间
{
        time_t tmptime;
        struct tm *tmptm;
        int  tmpyear;


        time(&tmptime);
        tmptm = (struct tm *)localtime(&tmptime);
        if(tmptm->tm_year > 90)
                tmpyear = 1900 + tmptm->tm_year%1900;
        else
                tmpyear = 2000 + tmptm->tm_year;


        sprintf(datetime,"%04d%02d%02d%02d%02d%02d",tmpyear,tmptm->tm_mon+1,tmptm->tm_mday,tmptm->tm_hour,tmptm->tm_min,tmptm->tm_sec);

        return(0);
}


调用：UnionGetFullSystemDateTime(time);

结果：time = [20160505193102]



int GetFullSystemDate(char *strdate) ----获取八位的时间
{
        time_t tmptime;
        struct tm *tmptm;
        int  tmpyear;


        time(&tmptime);
        tmptm = (struct tm *)localtime(&tmptime);
        if(tmptm->tm_year > 90)
                tmpyear = 1900 + tmptm->tm_year%1900;
        else
                tmpyear = 2000 + tmptm->tm_year;

        sprintf(strdate,"%04d%02d%02d",tmpyear,tmptm->tm_mon+1,tmptm->tm_mday);

        return(0);
}





int GetSystemYear(char *stryear)-----获取系统年份
{
        time_t tmptime;
        struct tm *tmptm;
        int  tmpyear;


        time(&tmptime);
        tmptm = (struct tm *)localtime(&tmptime);
        if(tmptm->tm_year > 90)
                tmpyear = 1900 + tmptm->tm_year%1900;
        else
                tmpyear = 2000 + tmptm->tm_year;

        sprintf(stryear,"%04d",tmpyear);

        return(0);
}