How compare 2 dates

Question

hello
i need compare 2 dates and fird difference between them
for example 30 september and 1 october
difference = 1 day
how i can make it ?
compareTo(Date) make it something else
here is code
import java.util.*;
import java.text.*;
public class DateWork2 {
public static void main(String[] args){
int i;
GregorianCalendar today=new GregorianCalendar();
GregorianCalendar oldday=new GregorianCalendar (2001,Calendar.AUGUST,16);
Date d1 = today.getTime();
Date d2 = oldday.getTime();
DateFormat df_today=DateFormat.getDateInstance(DateFormat.SHORT);
DateFormat df_oldday=DateFormat.getDateInstance(DateFormat.SHORT);
String s1=df_today.format(d1);
String s2=df_oldday.format(d2);
System.out.println(s1);
System.out.println(s2);
i=d1.compareTo(d2);
System.out.println(i);
thanks at advance

Answer 1

If you call getTime on a Date object (yes, this is totally different from Calendar's getTime), you'll get the number of milliseconds since 1970-01-01 00:00:00 UTC. Therefore,
d1.getTime() - d2.getTime()is the time difference in milliseconds. To convert it to days, simply divide by 86 400 000.