/**
* Sets the time zone of the datetime, changing the chronology and field values.
*
* <p>Changing the zone using this method retains the millisecond instant. The millisecond instant
* is adjusted in the new zone to compensate.
*
* <p>chronology. Setting the time zone does not affect the millisecond value of this instant.
*
* <p>If the chronology already has this time zone, no change occurs.
*
* @param newZone the time zone to use, null means default zone
* @see #setZoneRetainFields
*/
public void setZone(DateTimeZone newZone) {
newZone = DateTimeUtils.getZone(newZone);
Chronology chrono = getChronology();
if (chrono.getZone() != newZone) {
setChronology(chrono.withZone(newZone)); // set via this class not super
}
}
/**
* Sets the time zone of the datetime, changing the chronology and millisecond.
*
* <p>Changing the zone using this method retains the field values. The millisecond instant is
* adjusted in the new zone to compensate.
*
* <p>If the chronology already has this time zone, no change occurs.
*
* @param newZone the time zone to use, null means default zone
* @see #setZone
*/
public void setZoneRetainFields(DateTimeZone newZone) {
newZone = DateTimeUtils.getZone(newZone);
DateTimeZone originalZone = DateTimeUtils.getZone(getZone());
if (newZone == originalZone) {
return;
}
long millis = originalZone.getMillisKeepLocal(newZone, getMillis());
setChronology(getChronology().withZone(newZone)); // set via this class not super
setMillis(millis);
}