C program to find the number of days between two dates

Monday, 12 December 2011

C program to find the number of days between two dates

#include<stdio.h>
#include<conio.h>

void days(int,int,int,int,int,int);
int month(int,int);
int mon[12]={31,28,31,30,31,30,31,31,30,31,30,31};

main()
{
int a1,b1,c1,a2,b2,c2;
clrscr();
printf("Enter first date(dd mm yyyy) : ");
scanf("%d%d%d",&a1,&b1,&c1);
printf("\nEnter second date(dd mm yyyy) : ");
scanf("%d%d%d",&a2,&b2,&c2);
if(c2>=c1)
days(c1,c2,b1,b2,a1,a2);
else
days(c2,c1,b2,b1,a2,a1);
getch();
}

void days(int y1,int y2,int m1,int m2,int d1,int d2)
{
int count=0,i;
for(i=y1;i<y2;i++)
{
if(i%4==0)
count+=366;
else
count+=365;
}
count-=month(m1,y1);
count-=d1;
count+=month(m2,y2);
count+=d2;
if(count<0)
count=count*-1;
printf("The no. of days b/w the 2 dates = %d days",count);
}

int month(int a,int yy)
{
int x=0,c;
for(c=0;c<a-1;c++)
{
if(c==1)
{
if(yy%4==0)
x+=29;
else
x+=28;
}
else
x+=mon[c];
}
return(x);
}