Firestore query by date range

Question

I need the help to query long collection with date range. See the below example document. I wanna query startTime field using date range.

Answer 1

The solution is to use Date.now (), stop using timestamp service from firebase, you need to work with the numerical value of the time in milliseconds like for example: 1514271367000, instead if firestore uses 26/12/2017 1:56:07 GMT- 0500 (-05) will not work. An example of a query is:

this.fsService.afs.collection('chats/4bY1ZpOr1TPq8bFQ3bjS/finance/123+finance/12345'
          , ref => ref.orderBy('hour').startAt(1514184967000).endAt(1514271367000))
          .valueChanges().subscribe(data =>{
            this.mensajes = data;
          })

Answer 2

For everyone recently using firbase firestore. There's a differency depending on your settings of your firebase implentation (depending on the firebase version).

Before, firestore was saving Timestamp as a Date, however as described here in the docs the will be replaced soon by a Timestamp object. See the Timestamp docs here.

You can force your implementation already by adding a setting in your code to force firebase to use Timestamp objects instead of Date like this example:

var firebaseApp = firebase.initializeApp({
    apiKey: [APIKEY],
    authDomain: [FIREBASEAPPDOMAIN],
    projectId: [PROJECTID]
});

var firestore = firebase.firestore();
var settings = { timestampsInSnapshots: true }; // force Timestamp instead of Date
firestore.settings(settings);

Answer 3

const event = new Date();
const expirationDate = admin.firestore.Timestamp.fromDate(event);
const query = collectionRef.where('startTime', '<=', expirationDate)