Program to calculate days difference between two dates in java.

[KADRI]

Hello friends,
I am last year B.Sc.I.T. student. I recently started learning java language. In our last lecture our sir has given one program like "Write a Program to calculate days difference between two dates in java", but none of us able to write right program. That's why I am asking this question on this forum. Any one know how to write Program to calculate days difference between two dates in java. Please help me.
Thanks in advanced.

[absolute55]

In the following example we are going to calculate the differences between two dates. For this you have to first converts the actual date value into the corresponding date / time value in milliseconds and then do the math so we can get the different in days, hours, minutes, etc.

package org.kodejava.example.util;
 
import java.util.Calendar;
 
public class DD
{   
    public static void main(String[] args)
    {
       
       Calendar c1 = Calendar.getInstance();
       Calendar c2 = Calendar.getInstance();
         
           c1.set(2006, 12, 30);
        c2.set(2007, 5, 3);
 
        long milis1 = c1.getTimeInMillis();
        long milis2 = c2.getTimeInMillis();

        long d = milis2 - milis1;
         
        long dSeconds = diff / 1000;
         
 
        long dM = d / (60 * 1000);
       
        long dH = d / (60 * 60 * 1000);

        long dD = d / (24 * 60 * 60 * 1000);
         
        System.out.println("In milliseconds: " + d + " milliseconds.");
        System.out.println("In seconds: " + dS + " seconds.");
        System.out.println("In minutes: " + dM + " minutes.");
        System.out.println("In hours: " + dH + " hours.");
        System.out.println("In days: " + dD + " days.");
    }
}

[Reegan]

You have to use setTimeInMillis(long millis) method to set current time in calendar object and you have to use getInstance() method to get a calendar using the default time zone, locale and current time.

import java.util.Calendar;
 
public class DateDifferent{    
    public static void main(String[] args){
    Calendar c1 = Calendar.getInstance();
    Calendar c2 = Calendar.getInstance();
    c1.set(2010, 01, 21);
    ca2.set(2010, 10, 21);
    long m1 = calendar1.getTimeInMillis();
    long m2 = calendar2.getTimeInMillis();
    long d = m2 - m1;
    long dS = d / 1000;
    long dM = d / (60 * 1000);
    long dH = d / (60 * 60 * 1000);
    long dD = d / (24 * 60 * 60 * 1000);
    System.out.println("\nThe Date Different Example");
    System.out.println("Time in milliseconds: " + d
 + " m.");
    System.out.println("Time in seconds: " + dS
 + " seconds.");
    System.out.println("Time in minutes: " + dM 
+ " minutes.");
    System.out.println("Time in hours: " + dH
+ " hours.");
    System.out.println("Time in days: " + dD 
+ " days.");
  }
}

[opaper]

Hey it very easy process to calculate days difference between two days. I had written one example of it. Just go through it.

import java.util.Date;
import java.util.GregorianCalendar;


public class DateDifference {
  public static void main(String[] av) {
    
    Date da1 = new GregorianCalendar(2000, 11, 31, 23, 59).getTime();


    Date today1 = new Date();

 
    long diff1 = today1.getTime() - da1.getTime();

    System.out.println("The year (up to " + today + ") is "
        + (diff1 / (1000 * 60 * 60 * 24)) + "  the days old.");
  }
}

[MindSpace]

Hey you have to use following code in your program to calculate days difference between two days.

   
 public static long daysBetween(Calendar sDate, Calendar eDate) {  
   Calendar d = (Calendar) sDate.clone();  
  long dBetween = 0;  
   while (d.before(eDate)) {  
     d.add(Calendar.DAY_OF_MONTH, 1);  
     dBetween++;  
   }  
   return dBetween;  
 }  
  12. }

[zakm]

Lol! It is blatantly obvious that you are a UOM student. I find it hard to believe that final year students have hardly touched java, even out of pure interest in programming. A search on google heads plenty of results which do exactly what you want as well.