Saving and retrieving date in Firebase

Question

I have a model with the following structure

public class OfferModel {
    private String mImageUrl;
    private String mOfferCode;
    private String mOffe         


        

Answer 1

Use ISO 8601 date format:

SimpleDateFormat ISO_8601_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:sss'Z'");

String now = ISO_8601_FORMAT.format(new Date());

Representing Date as a String has two greater advantages:

• It is human readable ("2018-03-30T13:18:39.516Z" vs 1522415925281)
• At the browser side, you can simply invokes new Date("2018-03-30T13:18:39.516Z")

This is quite useful if you have Android and browsers both consuming Firebase data.

Answer 2

You can store the date as an epoch date. It's a long that you can get using your system time System.currentTimeMillis(); or by using the Firebase server time with their ServerValue.TIMESTAMP. The thing with the first option is that it changes with timezones and system settings. So if you store the date as a long, you just have to change your OfferModel field mStartDate to a long and then use new Date(long) to get the corresponding Date when retrieving the object.

Answer 3

you can set a date object on Firebase

yourReference.setValue(new Date());

It works, But

I noticed other PROBLEM with the date, when i changed the month manually from the db, when retrieving it the value stays as before

Answer 4

This is how I managed to store Date on Firebase by using the SimpleDateFormat to convert it to only a date without seconds, hours or milliseconds.

public void storeDatetoFirebase() {

    handler = new Handler();

    runnable = new Runnable() {
        @Override
        public void run() {
            handler.postDelayed(this, 1000);
            try {
                Date date = new Date();
                Date newDate = new Date(date.getTime() + (604800000L * 2) + (24 * 60 * 60));
                SimpleDateFormat dt = new SimpleDateFormat("yyyy-MM-dd");
                String stringdate = dt.format(newDate);

                System.out.println("Submission Date: " + stringdate);
                DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference().child("My_Date");
                databaseReference.child("init_date").setValue(stringdate);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    };
    handler.postDelayed(runnable, 1 * 1000);
}

and this is how it appears on Firebase:

Hope it helps..

Answer 5

Although firebase does support Date format datatype, I would prefer to save date-time in a string format, because by storing it as a string it becomes quite easy to retrieve it.

To store current system date-time in a string format just below code will do.

        DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        Date date = new Date();
        String strDate = dateFormat.format(date).toString();
        myRef.child("datetime").setValue(strDate);   

Now one can use the strDate to store in the firebase or do whatever one want to do with that string.