dateOfBirthFromPesel function

DateTime dateOfBirthFromPesel({ required String pesel, })

returns date of birth from pesel number

throws InvalidPeselException if pesel number is invalid

Implementation

DateTime dateOfBirthFromPesel({
  required String pesel,
}) {
  if (!validatePesel(pesel: pesel)) {
    throw InvalidPeselException();
  }

  final century = _getCentury(pesel);
  final year = century.string() + pesel.substring(0, 2);

  var month = pesel.substring(2, 4);

  month = (int.parse(month) - century.monthOffset()).toString();

  // month format - MM
  if (month.length == 1) {
    month = '0$month';
  }

  final day = pesel.substring(4, 6);

  return DateTime.parse('$year-$month-$day');
}