日期差值算法

#include<cstdio>
int month[13][2]={
    {0,0},{31,31},{28,29},{31,31},{30,30},{31,31},{30,30},{31,31},{31,31},{30,30},{31,31},{30,30},{31,31}
};
bool isLeap(int year){
    return(year%4==0&&year%100!=0)||(year%400==0);
}
int main(){
    int time1,y1,m1,d1;
    int time2,y2,m2,d2;
    while(scanf("%d%d",&time1,&time2)!=EOF){
      if(time1>time2){
          int temp=time1;
          time1=time2;
          time2=temp;
      }  
      y1=time1/10000,m1=time1%10000/100,d1=time1%100;
      y2=time2/10000,m2=time2%10000/100,d2=time2%100;
      int ans=1;
    while(y1<y2||m1<m2||d1<d2){
        d1++;
        if(d1==month[m1][isLeap(y1)]+1){
        m1++;
        d1=1;
    }
    if(m1==13){
        y1++;
        m1=1;
    }
    ans++;
     }
     printf("%d\n",ans);
    }
    return 0;
}