Geeksforgeeks Solution For " Find number of days between two given dates "

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Problem :- Given two dates, find total number of days between them. The count of days must be calculated in O(1) time and O(1) auxiliary space.

Note :- The system follows Gregorian calendar from the beginning of the time.

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Solution :-

using namespace std;

struct Date
int d, m, y;
const int monthDays[12] = {31, 28, 31, 30, 31, 30,31, 31, 30, 31, 30, 31};

int countLeapYears(Date d)
int years = d.y;
if (d.m <= 2)
return years / 4 - years / 100 + years / 400;
int getDifference(Date dt1, Date dt2)
long int n1 = dt1.y*365 + dt1.d;
for (int i=0; i<dt1.m - 1; i++)
n1 += monthDays[i];
n1 += countLeapYears(dt1);

long int n2 = dt2.y*365 + dt2.d;
for (int i=0; i<dt2.m - 1; i++)
n2 += monthDays[i];
n2 += countLeapYears(dt2);
return (n2 - n1);

int main()
    int t,d,m,y;
Date dt1,dt2;
cout<<abs(getDifference(dt1, dt2))<<endl;
return 0;


Geeksforgeeks Solution For " Find number of days between two given dates "

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  1. Ghanendra Yadav thanks for updating

    1. Thanks For Comment. Happy 2 Help Please share with friends Thanks