Determine the number of days between two birthdates

Question

Two friends want to know HOW MUCH OLDER the first friend is compared to the second friend. Write a program that will determine the number of days between their two birthdays, assuming the birthdays follow the format MMDD and that both friends are born on the same year.

I am new to programming and I need help in answering this question! Thanks!

You should probably look at how you can convert strings to dates. Let us know if you have any issues. Also, you should probably use `LocalDate` (from Joda-Time library) instead of Java's `Date` class — TheLostMind, Sep 01 '15 at 06:26

score 0 · Answer 1 · answered Sep 01 '15 at 06:23

Program to calculate no of days between two dates :

import java.util.Date;
class Example{
public int numberOfDays(String fromDate,String toDate)
{    
   java.util.Calendar cal1 = new java.util.GregorianCalendar();
   java.util.Calendar cal2 = new java.util.GregorianCalendar();

   //split year, month and days from the date using StringBuffer.
   StringBuffer sBuffer = new StringBuffer(fromDate);
   String yearFrom = sBuffer.substring(6,10);
   String monFrom = sBuffer.substring(0,2);
   String ddFrom = sBuffer.substring(3,5);
   int intYearFrom = Integer.parseInt(yearFrom);
   int intMonFrom = Integer.parseInt(monFrom);
   int intDdFrom = Integer.parseInt(ddFrom);

   // set the fromDate in java.util.Calendar
   cal1.set(intYearFrom, intMonFrom, intDdFrom);

   //split year, month and days from the date using StringBuffer.
   StringBuffer sBuffer1 = new StringBuffer(toDate);
   String yearTo = sBuffer1.substring(6,10);
   String monTo = sBuffer1.substring(0,2);
   String ddTo = sBuffer1.substring(3,5);
   int intYearTo = Integer.parseInt(yearTo);
   int intMonTo = Integer.parseInt(monTo);
   int intDdTo = Integer.parseInt(ddTo);

   // set the toDate in java.util.Calendar
   cal2.set(intYearTo, intMonTo, intDdTo);

   //call method daysBetween to get the number of days between two dates
   int days = daysBetween(cal1.getTime(),cal2.getTime());
   return days;
   }

   //This method is called by the above method numberOfDays
   public int daysBetween(Date d1, Date d2)
   {
    return (int)( (d2.getTime() - d1.getTime()) / (1000 * 60 * 60 * 24));
   }
   public static void main(String args[]){
   Example obj= new Example();
   int num= obj.numberOfDays("04-19-2013", "07-19-2013");
   System.out.println("Number of days between mentioned dates are: "+num);
  }
 }

Determine the number of days between two birthdates

1 Answers1