部分日期计算错误，但是有些显示是对的，没有找到规律，请大神帮忙看看代码哪里错了，谢谢！！
#include
#define isPrime(year) ((year%4==0&&year%100!=0)||(year%400==0))
struct date
{
int year;
int month;
int day;
};
int main(void)
{
int dateDiff(struct date mindate,struct date maxdate);
struct date mindate,maxdate;
int days;
int hours;
printf("请输入开始日期，格式[年-月-日]: ");
scanf("%i %i %i",&mindate.year,&mindate.month,&mindate.day);
printf("请输入结束日期，格式[年-月-日]: ");
scanf("%i %i %i",&maxdate.year,&maxdate.month,&maxdate.day);
days=dateDiff(mindate,maxdate);
printf("您输入的两个日期间隔: %i 天,",days);
printf(" 大概: %i 小时\n\n", days * 24);
printf("以上结果仅供参考\n\n");
system ("pause");
}
int dateDiff(struct date mindate,struct date maxdate)
{
int days=0,j,flag;
const int primeMonth[][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}};
for(j=mindate.year;j<maxdate.year;++j)
days+=isPrime(j)?366:365;
flag=isPrime(maxdate.year);
for (j=1;j<maxdate.month;j++)
days+=primeMonth[flag][j-1];
flag=isPrime(maxdate.year);
for (j=1;j<mindate.month;j++)
days-=primeMonth[flag][j-1];
days=days+maxdate.day-mindate.day;
return days;
}
