getBackupOpenedTime method
Implementation
Future<DateTime?> getBackupOpenedTime() async {
final prefs = await SharedPreferences.getInstance();
final millisecondsSinceEpoch = prefs.getInt(_backupOpenedTime);
if (millisecondsSinceEpoch != null) {
return DateTime.fromMillisecondsSinceEpoch(millisecondsSinceEpoch);
} else {
return null;
}
}