addMonths method

DateTime addMonths(
  1. int months
)

Adds whole months, clamping the day (Jan 31 + 1 month → Feb 28/29). date.addMonths(1)

Implementation

DateTime addMonths(int months) {
  final int target = year * 12 + month - 1 + months;
  final int y = target ~/ 12;
  final int m = target % 12 + 1;
  final int lastDay = DateTime(y, m + 1, 0).day;
  return copyWith(year: y, month: m, day: min(day, lastDay));
}