Name: joT67522 Date: 11/12/97


Problem Description:

Construct 2 calendar objects using a date,
year, month, hour, min, sec.

Check if the calendar objects are same.

In JDK 1.1.3, they are same ( which is what
one would expect ), where as in JDK 1.1.4, they
are different.

The objects are different in JDK 1.1.4 because
it seems that JDK supplies a millisecond value
while in 1.1.3, JDK always supplied 0 as a millisecond
value.

We are having big problems because of this.

1. Can someone explain what would be the correct behavior
   to expect from the Date and Calendar classes ?

2. Is there a constructor which takes millisecond
   as an argument ?

3. Does the Calendar object always "complete" every
   unspecified field ? If so, what is an exhaustive list
   of fields ? I had thought, hour min sec date month
   year, to be exhaustive...now, it looks like in 1.1.4
   you have added the millisecond field to the list.

4. Doing a toString on the Calendar object or on a Date
   object does not show all fields, such as millisecond...
   I think, you should make sure that every field which is
   used to compute a precision of a time value, must
   be displayed to the user.

Thanks,

Debapriya Ray ( Deep )

--------------------- code sample ----------------

import java.util.*;
import java.io.*;

public class date
{
 public static void main( String[] args )
 {
  GregorianCalendar cal1 = new GregorianCalendar();
  cal1.set( Calendar.YEAR, 1997 );
  cal1.set( Calendar.MONTH, 10 );
  cal1.set( Calendar.DATE, 11 );
  cal1.set( Calendar.HOUR, 10 );
  cal1.set( Calendar.MINUTE, 20 );
  cal1.set( Calendar.SECOND, 40 );

  System.out.println( " Cal1 = " + cal1.getTime().getTime() );
  System.out.println( " Cal1 time in ms = " + cal1.get(Calendar.MILLISECOND) );
  for( int k = 0; k < 100 ; k++ );

  GregorianCalendar cal2 = new GregorianCalendar();
  cal2.set( Calendar.YEAR, 1997 );
  cal2.set( Calendar.MONTH, 10 );
  cal2.set( Calendar.DATE, 11 );
  cal2.set( Calendar.HOUR, 10 );
  cal2.set( Calendar.MINUTE, 20 );
  cal2.set( Calendar.SECOND, 40 );

  System.out.println( " Cal2 = " + cal2.getTime().getTime() );
  System.out.println( " Cal2 time in ms = " + cal2.get(Calendar.MILLISECOND) );
  if( cal1.equals( cal2 ) )
System.out.println(" Cal1 == Cal2 " );
  else
System.out.println(" Cal1 != Cal2 " );

 }
}

------------------- JDK 113 output ----------------
compile and run using JDK 113:

 Cal1 = 879261640000
 Cal1 time in ms = 0
 Cal2 = 879261640000
 Cal2 time in ms = 0
 Cal1 == Cal2

-------------------- JDK 114 output ---------------

 Cal1 = 879265240216
 Cal1 time in ms = 216
 Cal2 = 879265240246
 Cal2 time in ms = 246
 Cal1 != Cal2
(Review ID: 20021)
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