やりたいこと

flutterとfirebaseを用いて今月のデータのクエリをしたいのですが、取得できませんでした。
ご教授お願いします。

dart
1
2  List<ShowData> personDataBirthdayList = [];
3
4
5  static DateTime todayDate = DateTime.now();
6  Timestamp nowTimeDate = Timestamp.fromDate(DateTime(todayDate.month));
7  Timestamp DateEnd = Timestamp.fromDate(DateTime.utc(todayDate.month + 1));
8
9  //データの取得　
10  Future getSecondPageBir() async {
11    final snapshot = await FirebaseFirestore.instance
12        .collection('users')
13        .doc(uid)
14        .collection('data')
15        .where('birthday')
16        .startAt([nowTimeDate])
17        .endAt([DateEnd])
18        .get();
19    final docs = snapshot.docs;
20    final personDataBirthdayList = docs.map((doc) => ShowData(doc)).toList();
21    this.personDataBirthdayList = personDataBirthdayList;
22    notifyListeners();
23  }
24
25  //データの取得　　リアルタイム
26  Future getSecondPageBirRealtime() async {
27    final snapshots = await FirebaseFirestore.instance
28        .collection('users')
29        .doc(uid)
30        .collection('data')
31        .where('birthday')
32        .startAt([nowTimeDate])
33        .endAt([DateEnd])
34        .snapshots();
35    snapshots.listen((snapshot) {
36      final docs = snapshot.docs;
37      final personDataBirthdayList = docs.map((doc) => ShowData(doc)).toList();
38      this.personDataBirthdayList = personDataBirthdayList;
39      notifyListeners();
40    });
41  }
42}
43

dart
1class ShowData{
2  ShowData(DocumentSnapshot doc){
3    this.name = doc['name'];
4    this.description = doc['description'];
5    this.sex = doc['sex'];
6    this.company = doc['company'];
7    this.age = doc['age'];
8    this.imgURL = doc['img'];
9    this.like = doc['like'];
10    this.documentID = doc.id;
11    this.timeNow = doc['timeNow'];
12    this.birday = doc['birday'];
13  }
14
15  String? documentID;
16  String? name;
17  String? description;
18  int? sex;
19  String? company;
20  int? age;
21  String? imgURL;
22  bool? like;
23  Timestamp? timeNow;
24  Timestamp? birday;
25
26}
27