Hi Eric,
simply keep in mind that Calendar.getInstance() gets a Calender instance (in fact a
GregorianCalender one) with the current date.
This does not imply day, month & year but also hours, minutes, seconds & milliseconds!
So each time you call getInstance() you will get the current time in milliseconds
also. Therefore if you are only interested in differences in days and not milliseconds
you will have to use either the same object (get one instance and clone it) or make
sure that the time part in your calender object is the same (e.g. 00:00:00.000).
Regards,
Stefan.
"Shiau, Eric" wrote:
> Curious,
>
> But both programs do not set time. Shouldn't it behave the same? Shouldn't
> its output be the same?
>
> > -----Original Message-----
> > From: Rudy Gireyev [SMTP:[EMAIL PROTECTED]]
> > Sent: Wednesday, February 07, 2001 12:56 PM
> > To: Shiau, Eric; '[EMAIL PROTECTED]'
> > Subject: RE: Help: Date Difference
> >
> > You are only setting the date and not the time.
> > That accounts for the difference.
> >
> > Also, you can use the following list for non Swing
> > questions if you like. Send INFO JAVA to
> > [EMAIL PROTECTED]
> >
> > Rudy
> >
> >
> > -----Original Message-----
> > From: Shiau, Eric [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, February 07, 2001 8:09 AM
> > To: '[EMAIL PROTECTED]'
> > Subject: Help: Date Difference
> >
> >
> > > I wrote a date difference programs. However, two programs give me
> > > different results? one day difference, why? Program 1, show me output as
> > > 365; Program 2, show me 364.
> > >
> > > Both programs are identical except Program 2, embedded yy, mm, dd on the
> > > Calendar.set() method.
> > >
> > >
> > > Program 1:
> > > import java.util.*;
> > >
> > > public class Try {
> > > public static void main(String[] arg) {
> > > String ddd = "02/07/02";
> > > int yy = 2000 + Integer.parseInt(ddd.substring(6,8));
> > > int mm = Integer.parseInt(ddd.substring(0,2)) - 1;
> > > int dd = Integer.parseInt(ddd.substring(3,5));
> > > System.out.println(yy + " " + mm + " " + dd);
> > > Calendar mat = Calendar.getInstance();
> > > mat.set(yy, mm, dd);
> > > Calendar now = Calendar.getInstance();
> > > long days = (mat.getTime().getTime() - now.getTime().getTime()) /
> > > 86400000L;
> > > System.out.println(days);
> > > }
> > > }
> > >
> > > Program 2:
> > > import java.util.*;
> > >
> > > public class Try {
> > > public static void main(String[] arg) {
> > > String ddd = "02/07/02";
> > > Calendar mat = Calendar.getInstance();
> > > mat.set(2000 + Integer.parseInt(ddd.substring(6,8)),
> > > Integer.parseInt(ddd.substring(0,2)) - 1,
> > > Integer.parseInt(ddd.substring(3,5)));
> > > Calendar now = Calendar.getInstance();
> > > long days = (mat.getTime().getTime() - now.getTime().getTime()) /
> > > 86400000L;
> > > System.out.println(days);
> > > }
> > > }
> >
> >
> >
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