Name: dfC67450 Date: 08/17/98



java.util.GregorianCalendar.getActualMaximum(YEAR) always returns 292278994.
This is the reason of wrong work of other methods like computeTime().
The source code contains the comments

     * (!) The real maxima for YEAR depend on the type of calendar:
     *
     * Gregorian = May 17, 292275056 BC - Aug 17, 292278994 AD
     * Julian = Dec 2, 292269055 BC - Jan 3, 292272993 AD
     * Hybrid = Dec 2, 292269055 BC - Aug 17, 292278994 AD
     *
     * Most calendars, including default calendar objects, will be
     * hybrids. For the purposes of the LEAST_MAX_VALUES and
     * MAX_VALUES, we just use the outer limit 292278994 for now.
     * Computing a real maximum (as in getActualMaximum()) will
     * involve taking the other fields and the cutover into
     * account, an overly complex calculation for such an unlikely
     * date. Liu 6/5/98.

It means that actual maximum of YEAR should depend on ERA, DATE and MONTH fields.

Here is the test demonstrating the bug:

-----------------Test.java------------------------
import java.util.*;

public class Test {
  public static void main (String args[]){


    boolean passed = true;
    int field = Calendar.YEAR;

    GregorianCalendar calendar = new GregorianCalendar(1998, 10, 1);
    Date dateBefore = calendar.getTime();

    int maxYear = calendar.getActualMaximum(field);
    int years[] = {2000, maxYear-1, maxYear};
    System.out.println("maxYear: " + maxYear);


    for (int i = 0; i < years.length; i++) {
      calendar.set(field, years[i]);
      Date dateAfter = calendar.getTime(); // compute time and field
      int newYear = calendar.get(field);
      if (newYear != years[i]) {
        System.out.println(" Test failed with year = " + years[i]);
        System.out.println(" date before: " + dateBefore);
        System.out.println(" date after: " + dateAfter);
        System.out.println(" newYear should be equal the year, date, month and time shouldn't change");
      } else System.out.println(" Test passed with year = " + years[i]);
    }
  }

}
---------Output from the test---------------------
maxYear: 292278994
  Test passed with year = 2000
  Test passed with year = 292278993
  Test failed with year = 292278994
    date before: Sun Nov 01 00:00:00 GMT+03:00 1998
    date after: Thu Sep 28 08:34:08 GMT+03:00 292263053
    newYear should be equal the year, date, month and time shouldn't change
-------------------------------------------------

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