計算兩個日期間相差的天數

printf("%d",Abs(get(Y,M,D)-get(y,m,d)));
int get(int y,int m,int d){
    if(m<3){
        --y;
        m+=12;
    }
    return 365*y+y/4 - y/100+y/400+(153*m - 457)/5+d - 306;
}

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