private static Object[] computeResult(long ymd[], String format, String tz)
{
String st = null;
InvalidOperationException error = null;
if (ymd == null || MDateAndTime.isZeroDayMonth(ymd))
error = new InvalidParameterValueException("Incorrect datetime value");
else
try
{
st = DateTimeField.getFormatted(MDateAndTime.toJodaDateTime(ymd, tz),
format);