#include <iostream>
#include <ctime>
using namespace std;
int CalcHowManyDays(unsigned int Year, unsigned int Month, unsigned int Day, unsigned int *pSumOfDays)
{
//結構體tm初始化
struct tm begin = { 0 };
struct tm end = { 0 };
//計算年份-1900
begin.tm_year = Year - 1900;
end.tm_year = Year - 1900;
//計算月份-1
begin.tm_mon = 1 - 1;
end.tm_mon = Month - 1;
begin.tm_mday = 1;
end.tm_mday = Day;
//計算秒的差,再除以一天的秒數86400,計算天數差,+1即為第幾天
double second = difftime(mktime(&end), mktime(&begin));
*pSumOfDays = (unsigned int)(second / 86400)+1;
return 0;
}
int main(){
unsigned int SumOfDays=0;
CalcHowManyDays(2017,7,10,&SumOfDays);
cout<<SumOfDays<<endl;
return 0;
}
轉載于:https://www.cnblogs.com/JarvisCJ/p/7144086.html