Apr 2, 2012

C Program to compute the difference between two dates.

Write a C program to compute the difference between two dates. In this C Program, We check the date is valid or not and then calculating the No. of days of first date and second date from Jan 1 of first date, then subtract the smaller date from another. Read more about C Programming Language .

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#include<stdio.h>
#include<math.h>
#include<conio.h>
void main()
{
    int day1,mon1,year1,day2,mon2,year2;
    int ref,dd1,dd2,i;
    clrscr();
    printf("Enter first date  day, month, year\n");
    scanf("%d%d%d",&day1,&mon1,&year1);
    printf("Enter second date day, month, year\n");
    scanf("%d%d%d",&day2,&mon2,&year2);
    ref = year1;
    if(year2<year1)
    ref = year2;
    dd1=0;
    dd1=dater(mon1);
    for(i=ref;i<year1;i++)
    {
        if(i%4==0)
        dd1+=1;
    }
    dd1=dd1+day1+(year1-ref)*365;
    dd2=0;
    for(i=ref;i<year2;i++)
    {
        if(i%4==0)
        dd2+=1;
    }
    dd2=dater(mon2)+dd2+day2+((year2-ref)*365);
    printf("\n\n Difference between the two dates is %d days",abs(dd2-dd1));
    
    getch();
}




int dater(x)
{ int y=0;
    switch(x)
    {
        case 1: y=0; break;
        case 2: y=31; break;
        case 3: y=59; break;
        case 4: y=90; break;
        case 5: y=120;break;
        case 6: y=151; break;
        case 7: y=181; break;
        case 8: y=212; break;
        case 9: y=243; break;
        case 10:y=273; break;
        case 11:y=304; break;
        case 12:y=334; break;
        default: printf("Invalid Input\n\n\n\n"); exit(1);
    }
    return(y);
}

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