getLastMonth method

DateTime getLastMonth(
  1. DateTime date
)

获得下个月的DateTime

Implementation

DateTime getLastMonth(DateTime date) {
  int year = date.year;
  int month = date.month;

  month += 1;
  if (month > 12) {
    month -= 12;
    year += 1;
  }
  return DateTime(year, month, 1);
}