Save a timestamp to Firestore-CodePudding

I am using a date picker and time picker dialog to choose what date and time to save into a Firestore document. I am also using java's LocalDateTime to store locally what date and time I picked from the picker dialogs. Putting the LocalDateTime variable that I created for the Map<String, Object> and saving it into Firestore, saves the date and time as a Map field, and not a timestamp field. I saw a similar question here at this website but the solution is using LocalDateTime's predecessor, Date. I am not planning to replace LocalDateTime with the old version just to achieve what I am trying to do. If you guys know how to store the date and time to Firestore using LocalDateTime.

LocalDateTime Initialization:

LocalDateTime localDateTime = LocalDateTime.now();
int yr = localDateTime.getYear();
int mos = localDateTime.getMonthValue();
int dy = localDateTime.getDayOfMonth();
int hr = localDateTime.getHour();
int min = localDateTime.getMinute();

Date and Time Picker Dialog:

DatePickerDialog datePickerDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker datePicker, int year, int month, int day) {
            TimePickerDialog timePickerDialog = new TimePickerDialog(DateTimeChoose.this, new TimePickerDialog.OnTimeSetListener() {
                @Override
                public void onTimeSet(TimePicker timePicker, int hour, int minute) {
                    localDateTime = LocalDateTime.of(year, month 1, day, hour, minute);
                    DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("'Elections Will End On:\n'MMM dd, yyyy'\n@ 'hh:mm a");
                    electionsText.setText(dateTimeFormatter.format(localDateTime));
                }
            }, hr, min, false);
            timePickerDialog.show();
        }
    }, yr, mos-1, dy);

    datePickerDialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);
    datePickerDialog.show();

Storing date and time to Firestore:

CollectionReference admin = FirebaseFirestore.getInstance().collection("Admin");

    Map<String, Object> electionEndTime = new HashMap<>();
    electionEndTime.put("electionEndTime", localDateTime);

    admin.get()
            .addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
                @Override
                public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
                    String adminEmail = "";
                    List<DocumentSnapshot> documentSnapshots = queryDocumentSnapshots.getDocuments();
                    for (DocumentSnapshot documentSnapshot : documentSnapshots) {
                        adminEmail = documentSnapshot.getId();
                    }

                    admin.document(adminEmail).set(electionEndTime, SetOptions.merge());
                }
            });

Screenshot of Firestore document:

CodePudding user response：

You cannot use a LocalDateTime object, as it's not a supported data type. What you can use instead, is a Date object. You can simply write such a value as you already do in your code.