public function prolepticYear(Era $era, $yearOfEra)
{
if ($era instanceof MinguoEra === false) {
throw new ClassCastException("Era must be MinguoEra");
}
return $era == MinguoEra::ROC() ? $yearOfEra : 1 - $yearOfEra;
}
/**
* Gets the era applicable at this date.
* <p>
* The Minguo calendar system has two eras, 'ROC' and 'BEFORE_ROC',
* defined by {@link MinguoEra}.
*
* @return MinguoEra the era applicable at this date, not null
*/
public function getEra()
{
return $this->getProlepticYear() >= 1 ? MinguoEra::ROC() : MinguoEra::BEFORE_ROC();
}
