addMonths method

@override DateTime addMonths(DateTime date, int months)

Returns the date - DateTime.month + months with the week occurrence of the day.

Implementation

@override
DateTime addMonths(DateTime date, int months) {
  if (months == 0) return startDate(date);
  var localMonths = months;
  var localDate = startDate(date);
  if (localMonths.isNegative) {
    while (localMonths < 0) {
      localDate = previous(localDate);
      localMonths++;
    }
  } else {
    while (localMonths > 0) {
      localDate = next(localDate);
      localMonths--;
    }
  }
  return localDate;
}