Gets the month of the transition.
!(p)
If the rule defines an exact date then the month is the month of that date.
!(p)
If the rule defines a week where the transition might occur, then the month
if the month of either the earliest or latest possible date of the cutover.
Gets the month of the transition. !(p) If the rule defines an exact date then the month is the month of that date. !(p) If the rule defines a week where the transition might occur, then the month if the month of either the earliest or latest possible date of the cutover.
@return the month of the transition, not null