canUpdateAds method
Implementation
bool canUpdateAds(int updateFreqDays) {
final lastUpdatedString =
_prefs.getString(_lsKey.lastUpdated.toKeyString());
if (lastUpdatedString == null) return true;
final lastUpdated = DateTime.parse(lastUpdatedString);
final nextDate = lastUpdated.add(Duration(days: updateFreqDays));
return DateTime.now().isAfter(nextDate);
}