public void topPostMonth() {
        Calendar c = Calendar.getInstance();
        c.add(Calendar.DATE, -30);
        final Date d = c.getTime();

        final FirebaseFirestore db = FirebaseFirestore.getInstance();

        CollectionReference dbPost = FirebaseFirestore.getInstance().collection("Posting");

        dbPost.orderBy("time", com.google.firebase.firestore.Query.Direction.DESCENDING).endBefore(d).limit(10).get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {

                for (final DocumentSnapshot snapshotPost : task.getResult()) {
                    final String postID = snapshotPost.getId();

                    Log.i("postID", postID);

                    CollectionReference likeNumber = db.collection("Likes").document(postID).collection("like-id");
                    likeNumber.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                        @Override
                        public void onComplete(@NonNull final Task<QuerySnapshot> task2) {
                            if (task2.getException() == null) {

                                if (!task2.getResult().isEmpty()) {

                                    numberLikes = task2.getResult().size();




                                    CollectionReference dislikeNumber = db.collection("Dislikes").document(postID).collection("dislike-id");
                                    dislikeNumber.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                                        @Override
                                        public void onComplete(@NonNull Task<QuerySnapshot> task3) {

                                            if (task3.getException() == null) {

                                                numberDisliks = task3.getResult().getDocuments().size();

                                                if (task3.getResult().isEmpty()){
                                                    numberDisliks = 0;
                                                }

                                                pointsTotal = numberLikes - numberDisliks;



                                                Post model = snapshotPost.toObject(Post.class).withId(postID).setTotalPosints(pointsTotal);
                                                postArrayList.add(model);
                                                Collections.sort(postArrayList, new Comparator<Post>() {
                                                    @Override
                                                    public int compare(Post o1, Post o2) {
                                                        return ((Integer) o2.getTotalPoints()).compareTo((Integer) o1.getTotalPoints());
                                                    }
                                                });
                                                postAdapter.notifyDataSetChanged();


                                                Log.i("Like post: " + postID, String.valueOf(numberLikes));
                                            }


                                        }

                                    });


                                }
                            }
                        }

                    });

                    numberLikes = 0;

                }

            }
        });


    }