Name: avC70361 Date: 10/04/98



  The java.util.SimpleTimeZone.hasSameRules(TimeZone) works wrong. Consider two SimpleTimeZones both
with only daylight time start rule and the rules are different. The behavior of zones is the same because
they both do not use daylight time, but if we invoke method setEndRule for both zones with a valid rule the
zones behavior will change 'cause their start rules are different. Moreover, the spec(for
TimeZone.hasSameRules) states "Returns true if this zone has the same rule and offset as another zone.
That is, if this zone differs only in ID, if at all". And this zones have different start rules. So, the
result of hasSameRules(TimeZone) for the zones should be false. But the method returns true for such zones if
their offsets are the same.

Here is a test demonstrating the bug.
---------------HasSameRulesTest.java-------
import java.util.SimpleTimeZone;

public class HasSameRulesTest {

  public static void main(String args[]) {
    SimpleTimeZone tz1 = new SimpleTimeZone(0, "stz", 0, 1, 0, 0, 0, 0, 0, 0);
    SimpleTimeZone tz2 = new SimpleTimeZone(0, "stz", 1, 1, 0, 0, 0, 0, 0, 0);

    System.out.println("hasSameRules result before aplying end rule : " + tz1.hasSameRules(tz2));

    tz1.setEndRule(1, 6, 0, 0);
    tz2.setEndRule(1, 6, 0, 0);

    System.out.println("hasSameRules result after aplying end rule : " + tz1.hasSameRules(tz2));

  }
}
---------The test output------------
> java HasSameRulesTest
hasSameRules result before aplying end rule : true
hasSameRules result after aplying end rule : false

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