计算从1970年到现在累计的秒数

没啥技术含量，只不过是在没事干，就把这个也记上，Windows下好像有这个api函数，但是在wince下用不了，所以还得自己封装一个。大体代码如下：

/*the seconds of round year = 3600*24*366 */
#define SECONDOFROUNDYEAR 31622400
 
/*the seconds of general year = 3600*24*365 */
#define SECONDOFYEAR 31536000
 
unsigned int SecondsFrom1970()
{
    SYSTEMTIME st;
    unsigned int tTemp=0;
    unsigned int tSecond=0;
    int month_s[2][12]={{31,28,31,30,31,30,31,31,30,31,30,31},
    {31,29,31,30,31,30,31,31,30,31,30,31}};
    int nDays=0;
    int nCount=0;
    int i;
    int j;
 
    GetLocalTime(&st);
    tSecond=st.wHour*3600+st.wMinute*60+st.wSecond;
 
    for (i=1970;i<st.wYear;++i)
    {
        if (IsRound(i))
            ++nCount;
    }
 
    tTemp+=(st.wYear-1970-nCount)*SECONDOFYEAR+nCount*SECONDOFROUNDYEAR;
 
    if (st.wMonth>1)
    {
        if (IsRound(st.wYear))
        {
            for (j=0;j<st.wMonth-1;++j)
            {
                tTemp+=month_s[1][j]*MAXSECONDOFDAY;
            }
            tTemp+=(st.wDay-1)*MAXSECONDOFDAY+tSecond;
        }
        else
        {
            for (j=0;j<st.wMonth-1;++j)
            {
                tTemp+=month_s[0][j]*MAXSECONDOFDAY;
            }
            tTemp+=(st.wDay-1)*MAXSECONDOFDAY+tSecond;
        }
    }
    else
    {
        tTemp+=(st.wDay-1)*MAXSECONDOFDAY+tSecond;
    }
 
    return tTemp;
}
 
bool IsRound(int year)
{
    /*is round year?*/
    if((year%100)&&(year%4==0)) return 1;
    if((year%100==0)&&(year%400==0)) return 1;
    return 0;
}