add method

Date add(
  1. dynamic other
)

Add 2 dates

Implementation

Date add(dynamic other) {
  if (other is Date) {
    return Date(year + other.year, (month) + (other.month), (day) + (other.day));
  } else if (other is DateTime) {
    return Date(year + other.year, (month) + (other.month), (day) + (other.day));
  } else if (other is Duration) {
    return Date(year, month, (day) + (other.inDays));
  } else if (other is num) {
    return Date(year, month, (day) + (other.toInt()));
  }
  return this;
}