now method

Implementation

Future<DateTime?> now() async {
  try {
    if (_firebaseApp == null || _firebaseFirestore == null) {
      throw ("Before using Firebase time, you need to call init().");
    }
    DocumentReference ref = _firebaseFirestore!.collection("_time").doc();
    await ref.set({"timestamp": FieldValue.serverTimestamp()});
    DocumentSnapshot snap = await ref.get(GetOptions(source: Source.server));
    return (snap["timestamp"] as Timestamp?)?.toDate();
  } catch (e) {
    debugPrint(e.toString());
    return null;
  }
}