Can't set timezone for RDate with periods

[sunkup]

Hello there ~

It seems the setTimezone method of an RDate (this one), does not set the timezone of it's super-class (DateListProperty) when holding a non-empty list of periods. Is this wanted behavior and if so, why? It seems unexpected and would aid us in handling RDates with periods. :)

Below is the test for the method with a an addded assert statement, to show exactly what we mean.

Thank you and have a nice day!

public void testSetTimeZone() {
    RDate rDate = new RDate(new PeriodList());
    
    /*
    try {
        rDate.setTimeZone(timezone);
        fail("Should throw UnsupportedOperationException");
    }
    catch (UnsupportedOperationException uoe) {
        LOG.info("Caught exception: " + uoe.getMessage());
    }

    try {
        rDate.setTimeZone(null);
        fail("Should throw UnsupportedOperationException");
    }
    catch (UnsupportedOperationException uoe) {
        LOG.info("Caught exception: " + uoe.getMessage());
    }
    */

    rDate.setTimeZone(timezone);
    assertEquals(timezone, rDate.getPeriods().getTimeZone());
    
    // Added this - I would expect the RDate to have the time zone, too
    // because the ;TZID= is then generated from the RDate property
    assertEquals(timezone, rDate.getTimeZone());
}