validate method

@override bool validate(dynamic data)

Validates the provided data against this rule.

Returns true if the data is valid, false otherwise. Subclasses must implement this method.

Implementation

@override
bool validate(data) {
  if (data is DateTime) {
    final now = DateTime.now();
    int ageInYears = now.year - data.year;
    // Adjust if birthday hasn't occurred yet this year
    if (now.month < data.month ||
        (now.month == data.month && now.day < data.day)) {
      ageInYears--;
    }
    return ageInYears > age;
  }
  return false;
}