Return true if the specified date is within the valid range of this calendar (i.e., firstDate() <= date <= lastDate()), and false otherwise. Note that the valid range for a PackedCalendar is empty if its length is 0.
Return true if the specified date is within the valid range of this calendar (i.e., firstDate() <= date <= lastDate()), and false otherwise. Note that the valid range for a PackedCalendar is empty if its length is 0.