Date

[Ira Jain]

Hi,
I just wanted to know if we have a method which computes the difference between two dates or do we write a program for the same.I did try to look up in JDK documentation but could not find.
Will be obliged if somebody could help me.

[Jane Griscti]

Hi Ira,
I poked around in some books and the API and finally worked something out. It was easier when all you needed was the Date class but it's methods are deprecated now

import java.util.*;
class DaysBetweenDates {
    public static long days(Date startDate, Date endDate) {
        // converts from milliseconds
        return(Math.abs(endDate.getTime() -
                        startDate.getTime() ) / 86400000);
    }
    
    public static void main(String[] args) {
        // create a new calendar object
        Calendar cal = new GregorianCalendar(2000,                    Calendar.DECEMBER, 25);
        // convert it to Date type
        Date xmas = cal.getTime();
        Date today  = new Date();
    
        System.out.println("Days to Xmas: " + days(today, xmas));
    }                        
}

Hope that helps.
------------------
Jane
[This message has been edited by Jane Griscti (edited October 19, 2000).]

[star]

Here is a small program that calculates the differece between two dates. You can use Calendare class instead of Date as well.

import java.util.*;
public class ClassName extends Object {
/** Creates new ClassName */
public ClassName() {
}
public static void main(String str[])
{
Date today = new Date();
Date tomarrow = new Date(100,9,19);
Date differ = null;
long day1 = 0;
long day2 = 0;
long difference = 0;
System.out.println("today's date is: " + today);
System.out.println("other date is: " + tomarrow);
day1 = today.getTime();
day2 = tomarrow.getTime();
difference = (day2-day1)/(60*60*1000);//numbers of minustes

if ( difference <= 24 )
{
if ( difference < 0 )difference = -difference;
System.out.println("difference between two dates is : " +
 difference + "hours" );

//add code to show minute and second
}

else
{
difference = difference / 24;//number of days
long min = difference % 24;
System.out.println("difference between two dates is : " + 
   difference + "days," + min + "minutes," + min/60 + "seconds");

}
}
}

I added some UBB code here. -Mapraputa
[This message has been edited by Mapraputa Is (edited October 19, 2000).]

[Ira Jain]

Thanks a lot for your helpful codes.I was just trying to avoid writing code to do the same