/**
* Calculates the range of months based on the temporal.
*
* @param temporal the temporal, not null
* @return the month range, negative if not fixed range
*/
private long monthRange(Temporal temporal) {
ValueRange startRange = Chronology.from(temporal).range(MONTH_OF_YEAR);
if (startRange.isFixed() && startRange.isIntValue()) {
return startRange.getMaximum() - startRange.getMinimum() + 1;
}
return -1;
}
