Convert date to timestamp for storing into firebase firestore in javascript

You can simply use the following line:

var myTimestamp = firebase.firestore.Timestamp.fromDate(new Date());

.fromDate is a static method from the static Timestamp class from Firebase.

Ref: Firebase Timestamp Doc

Update:

For cloud functions look at JGuo's comment:

If you are writing cloud functions, it becomes admin.firestore.Timestamp.fromDate() – JGuo Jan 21 at 1:56

If you want to store a field as a timestamp in Firestore, you'll have to send a JavaScript Date object or a Firestore Timestamp object as the value of the field.

If you want to use Date, simply say new Date(x) where x is the value in milliseconds that you were trying to add before.

If you want to use Timestamp, you would have to do more work to get that x converted into a combination of seconds and nanoseconds to pass to the constructor, as the documentation suggests.

I solved it by using:

const created = firebase.firestore.Timestamp.fromDate(new Date()).toDate();

You have to import firebase from 'firebase/app' explicitly in your code.

import * as firebase from 'firebase/app'

Make sure your created or whatever constant is in type Date before actually being saved to firestore.