FULL PRODUCT VERSION :
java version "1.4.2_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_01-b06)
Java HotSpot(TM) Client VM (build 1.4.2_01-b06, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [版本 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
It is impossible to represent any minute between April 15 1990 00:00:00 to April 15 1990 01:00:00 using Calendar class.
In addition if a Calendar object is set to April 14 1990 00:00:00 and the object is increased one day by invoking add(Calendar.DAY_OF_MONTH, 1), the result will be April 14 1990 23:00:00.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
compile the folloing code and

java tt 04/14/1990

//------------------------------------------------------------------------------------------
import java.util.*;
import java.text.*;

public class tt
{
	static void showCalendar(Calendar cal)
	{
		System.out.println(	cal.get(Calendar.YEAR) + "/" +
							(cal.get(Calendar.MONTH) + 1)+ "/" +
							cal.get(Calendar.DAY_OF_MONTH) + "-" +
							cal.get(Calendar.HOUR_OF_DAY) + ":" +
							cal.get(Calendar.MINUTE) + ":" +
							cal.get(Calendar.SECOND) + "/" +
							cal.get(Calendar.DAY_OF_WEEK) + "-" +
							cal.getTimeZone().getID());
	}
	public static void main(String[] args)
	{
		try
		{
			DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
			Date d = df.parse(args[0]);
			Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("PRC"));
			cal.set(1990, 3, 15, 0, 59, 0);
			showCalendar(cal);
			cal.setTime(d);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 4);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 0);
			showCalendar(cal);
			cal.add(Calendar.DAY_OF_MONTH, 1);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 4);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 0);
			showCalendar(cal);
		}
		catch(Exception e)
		{
		}
	}
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
1990/4/15-0:59:0/1-PRC
1990/4/14-0:0:0/7-PRC
1990/4/14-4:0:0/7-PRC
1990/4/14-0:0:0/7-PRC
1990/4/15-0:0:0/7-PRC
1990/4/15-4:0:0/7-PRC
1990/4/15-0:0:0/7-PRC
ACTUAL -
1990/4/15-1:59:0/1-PRC
1990/4/14-0:0:0/7-PRC
1990/4/14-4:0:0/7-PRC
1990/4/14-0:0:0/7-PRC
1990/4/14-23:0:0/7-PRC
1990/4/14-4:0:0/7-PRC
1990/4/14-0:0:0/7-PRC

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.*;
import java.text.*;

public class tt
{
	static void showCalendar(Calendar cal)
	{
		System.out.println(	cal.get(Calendar.YEAR) + "/" +
							(cal.get(Calendar.MONTH) + 1)+ "/" +
							cal.get(Calendar.DAY_OF_MONTH) + "-" +
							cal.get(Calendar.HOUR_OF_DAY) + ":" +
							cal.get(Calendar.MINUTE) + ":" +
							cal.get(Calendar.SECOND) + "/" +
							cal.get(Calendar.DAY_OF_WEEK) + "-" +
							cal.getTimeZone().getID());
	}
	public static void main(String[] args)
	{
		try
		{
			DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
			Date d = df.parse(args[0]);
			Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("PRC"));
			cal.set(1990, 3, 15, 0, 59, 0);
			showCalendar(cal);
			cal.setTime(d);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 4);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 0);
			showCalendar(cal);
			cal.add(Calendar.DAY_OF_MONTH, 1);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 4);
			showCalendar(cal);
			cal.set(Calendar.HOUR_OF_DAY, 0);
			showCalendar(cal);
		}
		catch(Exception e)
		{
		}
	}
}
---------- END SOURCE ----------
###@###.### 2005-2-11 02:10:10 GMT