addDays static method
Implementation
static String addDays(String rulesDate, String daysToAdd) {
final dateMoment = _parseDate(rulesDate);
final newDateMoment = dateMoment.add(Duration(days: int.parse(daysToAdd)));
final newRulesDate = _dateFormat.format(newDateMoment);
return "'$newRulesDate'";
}