'How to store List<DateTime> in variable from firestore all single field time stampdata in flutter?

how to get firestore single field time stamp data to store in a List variable to use in somewhere else that need List?

DocumentReference documentReference =
     FirebaseFirestore.instance.collection('crud').doc();
     documentReference.get().then((dataSnapshot) {
       //  Map<String, dynamic> documentFields = snapshot.data.data;
       List<DateTime> dateStamp = (dataSnapshot.data()['bookDate'].toDate());
       return dateStamp;


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